Situation at 194 voters:
40% of the voters asking for a simple warning or a kick, 65% of them asking for a kick
53% of the voters asking for a ban, 50% of them asking for a 1/2 day ban only.
The interesting message about your poll is that 80% of the people asking for a kick prefer seeing it as a warning than a punishment, that should have a lot of meaning for admins.
The rest was a bit bit predictable, i mean 43% kicks / 57% bans (not counting the 11 clear trolls), because the offense you defined is too rare and too serious to give your poll a real meaning mate.
The guy is not joking or taking revenge, but really trying to tk around for no reason apparently, this doesn't happen much.
Also that part of the question: "...new guy spawns on your team,you've never seen him before...", makes it a rare case.
Most tk i see are spammers being careless (like me), then quite a few revenge and retaliation and anger from chat bullshit pple throw at each other, and ofc some trolling mate, not much of the kind you described there. You implied a harsh answer from voters in your question.
Most of them, it's true, didn't advise the kick, but only because this kind of offense is very rare and serious.
In all other cases I would prefer a kick if its the first time you see the offender behave that way, but if its not the first time at all, i would agree with 24H ban as a warning this kind of behavior is really offensive to other players and can't be tolerated.