By "even amateurs could make" I wanted to highlight how relatively simple of a molecule it is, not that they should. The impact is mostly industrial, those things that "even amateurs could make" tend to be really cheap.
With that in mind CH₂Cl₂ isn't that big of a deal. It's a reagent and it needs to be treated with respect and care; just like any other reagent. The worst mistakes don't even happen with those dangerous chemicals, it's with the ones that people think that are safe because they get sloppy with them. (Calcium carbide, glacial acetic acid, hydrogen peroxide, this sort of stuff.)