I think it's because they are being completist, including all of the chemicals from the original A. C. Gilbert chemistry set from the 1930s (plus a few extras t

I think it's because they are being completist, including all of the chemicals from the original A. C. Gilbert chemistry set from the 1930s (plus a few extras that they think are particularly useful). If you take out carbon tetrachloride, where do you stop? Lots of these are considered unsafe, and are well labelled as being poisonous.