It lets people know violence cannot change the balance of power
No it doesn't.
Say you support party A, which politician B is a member of. Politician B doesn't agree exactly with you though. And you don't like that.
So if you merc the candidate you don't agree with for the party you support, their runner up (who you preferred anyways) runs unopposed and is guaranteed to win even if everyone hates them.
Even if it's not intentional, just handing the election off is incredibly fucked up.
Why the fuck would anyone support this after understanding what it means?