I completely agree – but critical thinking involves something along the lines of "here are the things that I think are wrong, this is why I think they're wrong, this is how I think they could be solved."

The answer "let's throw everything out" isn't that useful; likewise, dismissing the considered opinion of lots of people who have been doing this sort of thing for a while needs to be done with some rationality. An empty, bandwagon-jumping appeal like this adds little value and just helps spread more misinformation.