I’m a libertarian and I believe in a “night watchmen state” https://en.m.wikipedia.org/wiki/Night-watchman_state
Not all libertarians are anarchists, that is a faction but not the majority IMO.
I would overhaul the law enforcement apparatus in my ideal society. But their current existence would not prevent me from providing information to them and asking for assistance if the reason was justified.
People calling Peter Thiel a hypocrite are wrong.