Simply about bringing the punishments into proportion with the error. If they don't kick up a stooshie this time, it'll never be changed (until a big club gets caught out).
Yeah I imagine if this happened in Real Madrid v Sarajevo play off qualifier UEFA would not have much problem bailing Real out like they did not have a problem admitting their rules were spectacularly stupid when they couldn't allow Liverpool to enter CL in 2005. This doesn't mean a thing though because strictly by rules they were right to send Legia packing from CL.