What's the goal of downvoting ?

Isn't the goal to modify behavior ?

Isn't a downvote a penalty ?

Distributing penalties is the role of POLICE (or vigilantes).

If someone owns stake, the reward pool doesn't care if they use that stake to self-vote or to vote for your favorite posts.

The reward pool gets "drained" exactly the same in either case.

I LOVE RULES, I JUST WANT TO KNOW WHAT THE RULES ARE.

I ALSO LOVE UNIFORM ENFORCEMENT.