(socially)Liberal values: Equality and fairness. The belief that everyone should have a fair chance in life. That descriminating against those that are different is wrong. That being born disadvantaged should not be a barrier to progress in life.
Every small victory toward that ideal(the battle is far from won, though much progress has been made in the last century) has been a fight against conservatives. The protectionists. Those that feel scared of change, maybe because they are happy with the status quo. Maybe because they benefit from the oppression of the disadvantaged. Maybe they simply don't realise the damage being done to vast communities on our planet. Maybe they are world-weary cynics, wanting to live out their lives unbothered by the woes of others.
Most leftists, I feel confident in saying, feel that helping refugees is essential, but that preventing those situations is even more important. The right wing, as a generalisation, reject the initial help overseas and frankly through their support of exploitative big business and oil wars for example(no, Blair was not a leftist), actually cause many of those problems. Then they typically object to helping refugees.
But you didn't mention refugees, which is typically the call of the left wing entertainment industry. You mentioned immigration. This is not a left wing thing! The sort of mass immigration we have seen in the last
20 years, under a mixture of governments, has been encouraged for the balance sheets and to fill a skills/labour shortage.
Short term thinking, with little recognisable planning for the consequences. The level of immigration could be reduced at any time by our government. Brexit or not. They simply need to stop most immigration from outside the EU. Or implement the rules that the EU already allows that would discourage many of those 250,000 last year. But not without hitting GDP. Before the whole brexit fiasco started Cameron understood this, he gambled that he could use the growing hostility towards the immigration levels to win elections, but actively dismantled some of the very few mechanisms in place to lessen the burden on the country that they caused. It didn't quite work out for him, and now we have a situation where we are being corralled into leaving the EU at a time when national and personal debt are at insane levels. Like I said, not a left wing thing.
Not everyone who is socially left wing, is fiscally left wing. It's an idea which is far less simple than free market capitalism, so is less understood by many. The answer from the left isn't simply give everyone more money, as much as it's painted as so. While the Conservatives are still clinging on to the idea that private businesses are better than the state for everything. The view of the left is that allowing business to put profit above all else is at the root of many social and economic problems that we face. While technology has helped boost the standard of living for many people in the world, that is no reason to not try to help those that have missed the boat. Improving education and healthcare will more than pay for itself, in the long run. As any good business knows, investing in the right areas brings great rewards. So austerity IS an idealogical choice. While it's perfectly fine for those that excel and provide something to the world to be rewarded, until we reach a point where no child goes hungry, at least, then maybe the richest can make do with just one yacht. A small one if necessary. Same goes for businesses. They can forgo paying tax by investing(not per se a bad thing) but when you have a government eager to sell off the natural and social resources of a country to those same companies, it doesn't take long to realise that there were big problems ahead when those profits stopped being reinvested.
A whole crowd at Glastonbury might not agree with everything I've written, or what Jeremy Corbyn has to say. The basic premise of peace, love, understanding and compassion should be lauded. It bloody should make a crowd cheer. The fact that these values are overtly left wing should tell you something. If I ever see a (socially)right wing gathering genuinely spreading the same message of positivity, then I'd applaud them too.
So while I do understand a wariness toward popularising politics, I see it as far less of a problem than, say, the daily mail putting negative stories about immigrants on their front page something like 23 out of the 30 days leading up to brexit(can't find link right now sorry), leaving it just a few days after the Jo Cox murder before starting again. That's the sort of crap to be scared about. So criticising a positive message just because they aren't having the whole conversation right there in front of you... I'm sorry but it just doesn't work for me.
There are things other people do that we all don't like. But standing up for their right to do them(with the obvious proviso of no harm to others) is not some niche echo chamber. It's been a hard fought battle and one that the youth of today rightly seem proud to be growing up within.
Sorry if the reply is a little long, but there appeared a strong under-current to your post that I felt needed addressing. I'd happily respond if you want to challenge anything I've written.
I'm pretty sure my point isn't the same as his.