Why was touch move invented?

What stops a troll from trying to throw you off by fondling all of your pieces one after another, disarranging them on their squares, picking up one piece after another and pretending to move it, only to draw back at the last moment?
Why encourage trolls? Why legitimize harrassment?
The touch-move rule is where the code of conduct meets the rule-book.

I played in OTB tournaments since the late 60s, and in rated OTB tournaments since the early 70s.
I've seen some disgraceful examples of conduct by tournament players. One got himself arrested.
There are rules of conduct for a reason. The reason is that people are jerks.

No, but you can be forfeited by the Tournament Director.
Is it really that painful to act like a normal person, instead of trying every scumbag trick you can think of to distract or annoy your opponent?