Encourage... people really need to stop using that word. A system within a game is not sentient. It cannot wave its arms and tell you "Hey, do this abusive thing with me! Please?"

A system cannot encourage players to do something. All it can do is possess an option; an option that not everybody is going to take.

It is true that the Vote Dismiss allowing for these kinds of situations is bad. However, the system isn't encouraging players to use it in the manners. The players are encouraging each other to use it in these manners. The offline afker is encouraging his party members to kick him by being absent from the dungeon. The intentional lockout is just being a jerk and would be able to do this whether kicking was possible or not.