PIs are used to catch cheating spouses, insider trading, theft and corporate espionage.
That doesn't mean PIs or given practices are immune to criticism. However, blunt statements such as "PIs are stalkers for hire" are so sloppy as to be factually incorrect and useless, and comparing them to rapists belays naiveity and an agenda.
> comparing them to rapists belays naiveity and an agenda.
An agenda huh? I guess you mean it's personal to me? Well you're right; a former employer sicced such goons on me and one of them got nasty. That's my "agenda" pal; being a victim of this profession.