On literally my first day in college, I learned about the fallacy of the "one-way correlation." 100% of mass murderers drank milk as children, but that doesn't mean drinking milk causes murder. You have to also look at the other half of the correlation-- what percent of people who take psychotropic medication become mass murderers?
Does milk carry a warning label that a side effect of drinking it could cause “suicidal ideation and or homicidal tendencies?
Ya, we know that correlation /= causation.
I suspect that particular phrase though, discounts what is going on a little too heavily. We know that psychotropic drugs can have some rather drastic effects on some folks. Everyone's brain chemistry is different, and the prescribing of drugs that seriously affect brain chemistry is more art than science, at best. Also, it's not necessarily the daily use that affects folks the most. The most dangerous time for folks on these drugs is if you have to suddenly stop taking them in a non-controlled manner for whatever reason. We know that this messes with people in some really unpredictable ways.
Therefore, their use of these drugs is worth looking at closely. It may not be causative, but then again, it could very well be a major contributing factor. Just to wave the concern away does no one any favors.