Any evidence for this? (Children's futures ruined)
None, but that's only because it hasn't happened YET. The government are masking it (pun intended) by waving the magic money tree at the problem. But it will happen. Eventually, the powers that be are going to play the card of "there's no money left" (and that's probably when Saint Boris will resign, so he can paint himself as the good guy up to that point), and the shit will really hit the fan. Millions will be unemployed, depressed (many of them children or teenagers), there will be massive tax rises for the poor and middle (not for the rich, of course), some people will be dead through suicide. And the moment, the government is trying to distract us from all that with "if we don't
destroy your lives take action, people will die". I'm certain there will be a lot of resignations in government just before the aftermath of their hallowed lockdown sets in: they'll just make it somebody else's problem.
While we are imprisoned at home, bored witness, unable to plan anything because we don't know when this indecisive government will next snatch everything away (probably just after telling us it's all OK, like Saint Boris did with the schools), we have oceans of time to brood on the very bleak future which the government is lovingly preparing for us. The government seem unable to contemplate this reality from their privileged positions, but we have plenty of time to do so.