It's the same old blither about how people talking us down are the real danger and they should just trust that it'll all work out in the end (because of course, those in charge have inspired SO much faith over the last couple of years). In the end, when this fails, everyone other than those actually responsible for this catastrophe will be blamed. The EU, Remainers, Project Fear, those fucking foreigners, the biased left wing media, the young (ie virtually everyone under 45), Labour, the SNP, pro-European Tories...they'll chuck Cruella under the bus too. I mean she deserves it to an extent because she's hopeless and a horrible cunt in her own right, but this isn't a situation that she created, she's just been palpably incapable of doing anything at all to fix it.
If something is obviously a disaster with zero redeeming features and the inevitable conclusion will be a shitshow that even Mr Magoo could see on the horizon, then it's reasonable, even essential at times to call it out as such. See Saunders, Dean. If you ignore all the signs and willingly sail to your own doom then that's a special kind of idiocy.