The problem is, in 99 out of 100 cases, alcohol.
I don't believe that's the root problem. Although 99% of troublemakers may have been taking alcohol, that's always been there. What has changed in recent years is the ban on smoking, which can upset the addicts. Maybe they resort to alcohol in lieu, maybe they do so every day, but their bodies are unused to extended periods without smoking, and this is why the rise in trouble has coincided with the smoking ban. It would be good to know what proportion of troublemakers are smokers who are being prevented from having one for extended periods.