I support a vote to kick feature even if it means that under geared or un-skilled players will be caught in the cross fire, and here's why.
I'll use AK for my example since it's the biggest cause of headache (next to jack asses in CM). 80% of the time my duty finder runs go fine, but then there are there's that 10% where someone is mean, rude, or even just bad. Today I had a run with a Scholar, who was new to the dungeon and was pretty under geared (just AF and lv45ish accessories, had ifrit book though). The rest of the group (blm(me), pld, brd) were all fine and helpful, we told him the strats for each fight and he did reasonably well. Passed first boss with minimal issues, he only got hit once on demon wall and didn't fall off, and healed just fine. But then...
On the last boss he just couldn't get behind the statues for the AOE. Every single time he would get one shot by the 2nd or 3rd Intimidate catastrophe which quickly lead to a wipe. The first few times it was ok, he was new and we all were patient with him, but around the 9th or 10th time it just got to be ridiculous.
We tried everything. We told him when to move, we told him to just follow me, we told him to stand behind the tank's pillar at the start and just stay there, but nothing worked. The guy just either wouldn't listen, reached too slowly, or didn't bother to move at all. And each time he had a different excuse.
I'm sorry to say but we also need to be able to kick people like this. I know it sounds cruel but we were all patient and helpful with the guy and he still couldn't get it right. There's only so much we could do, we couldn't complete the dungeon with him dying every time and he simply couldn't do it for whatever reason. We asked if he would be ok with leaving since he couldn't get it right but he refused, so at that point I would appreciate a vote to kick option.