A step like this one establishes the precedent. In a few years, the WSJ will be advocating locking up people they don't like, making they case that they are ipso facto mentally unstable, a threat to society, etc. How about protesters? Left-wing ones, of course.
Many people in business arguably belong in an asylum - how about the wealthiest person in the world? how about some WSJ op-ed writers? crypto bros? some SV VCs? - and mentally unstable people with power are far more threat than the person on the subway.