1. It seems that some academically-minded people like to nit-pick and fuss about not over-generalising and painting “broad strokes”.
2. If you really want to be picky, it is about using the correct quantifier: e.g. “all”, “almost always”, “most”, “many”, “some”, “almost never”, “none”, “56.9627% with s.d. 2.1446%”
3. In the real world, we do not always have all the information, or we may not have the time, energy, nor the luxury of research funds to carry out proper surveys or investigations to get the evidence. By the time we have that (if ever), it might be too late.
4. As a practical matter, if something occurs often enough for a layperson (e.g. their children and/or perhaps their friends’ and relatives’ children not getting enough sleep), it becomes an issue of concern, whether or not s/he has got the quantifier (“all”, “most” .. etc) right. It is a good-enough trigger for reflection, discussion and planning for remedial action.
5. Sometimes it is just prudent risk management (e.g. walking in a street in The Bronx, hiring the right person, … etc). It is not about the elusive “truth”. It is a practical mechanism in a complex dynamic environment and it is for survival.