I'm not advocating for or against anything here, just that alcohol is not a good example or comparison to use when arguing for some other mood-altering drug.
Now, how often do people get violent from taking mushrooms? Basically almost never, which is why a news story like this gets coverage.
Of course, people can and sometimes do (non-violently) freak out on mushrooms, which is why it's important to treat them with respect, take them with a sitter under a good set and setting, and perhaps ideally under the guidance of a therapist.
No actual evidence has been released regarding what happen, since the case never went to court (he took a plea).
EDIT: While my argument is sarcasm, there's both a change.org petition to ban raw caffeine [1], along with several senators who support such a ban [2].
0: https://www.nbcnews.com/health/health-news/south-carolina-te...
1: https://www.change.org/p/u-s-food-and-drug-administration-in...
2: http://cen.acs.org/articles/94/i18/US-senators-push-ban-caff...