I agree that the chance of Russian aggression is currently very low, the Finnish intelligence service said a couple of weeks ago that they estimate that under 25% of the Russian military personel and equipment stationed near the Finnish border 1 year ago are now left. But if we start giving up to much of our defense capabilties there is a chance someone in Russia might start getting some ideas, the more desperate they become the more unpredictable they will behave.
We are also one of the smallest countries in the EU, 5.5 million people or a little over 1% of the total population so even if we only give 4-6 tanks we would still have given way more then the EU average. There are other countries who are in a much better position to give tanks now, Greece and Spain for example have over 300 Leopards each and are in a much better place geographically speaking.
But as I stated further up my own opinion is that we should give more then a few, we should at least match the Germans and give a company worth of tanks now and if we could secure replacements within a reasonable time frame all of our 2A4s should be made available.