In the case that started the thread "the arsonist/burglars drank all the alcohol they could find", so maybe there's no reason to go assuming the drugs involved were the illegal sort. And I don't imagine many people think that going down the path of prohibiting alcohol, Taliban style, would make it any less likely.

These things happen. Fortunately they don't happen as much as we think they happen, now we have all the channels of news, including the Internet, so that we get to hear about them. The fact that they are infrequent doesn't make them hurt any less, but it means there are a lot of people who have escaped it happening to them and who can help out one way or another. That includes being ready to change things that need changing.