It is not just a solvent. You can use ethanol in hand sanitizer, but isopropanol is what you need for sarin. That's why it's on the precursor lists, but at a low level in recognition of its industrial uses.
Isopropyl alcohol is not a chemical weapon precursor, just like water isn’t a cyanide gas precursor.
Is doing a lot of work in that sentence. Ethanol is an alcohol, enjoy a lovely drink. Methanol is an alcohol, try not to to drink it. Alcohol is an incredibly broad family and the scheduled substance (Pinacolyl alcohol: 3,3-Dimethylbutan-2-ol) is not isopropyl alcohol. It’s not even close. It’s also not a precursor to sarin, but soman.
Notice that isopropanol isn’t scheduled at all, so I feel justified in asking if you were just confused or trying to be sneaky?
Oh and by the way, most alcohol hand sanitizers are 70% isopropyl alcohol, not ethanol.