The actions of such persons as described is usually horrible and barbaric that could go out of the police controls.
Ironically, the definition of lunatic depends much on the political context of where the conversation is taking place. There are members of the Republican party nowadays who could consider people protesting in favor of universal healthcare to be lunatic and deranged communists, you know. Mostly because all those political ideas (mostly from the political left) are directly against the agenda a pursuits of insurance companies, many of them being big donors to the Republican party in times of elections.
So what being a "lunatic" actually means in TRUMP world? probably it means whatever Trumps needs it be mean for him to take political advantage and further divide the country, keeping chances high for him to retake his lost position in the white house.
See, one does not need to physically misbehave or threaten someone in order to be labeled as a lunatic, it is enough by having opposite ideas from those the leader of the cult/party has, quite simple.