I don't see my credibility in debates to be my most basic problem. In the context of this whole conversation, I'd define the most basic problem of mine to be one of choosing a course of action that I will be at peace with. The closest you came to advice in that regard is, "Even though you rationalize it with, 'They would be so-and-so even if I weren't there.' you are still taking part in something you strongly disagree with." Maybe that was your main advice, in which case my earlier analysis of your advice is wrong, but it read to me as more of an aside than anything.
I did not have an answer to my quandary when I posed it to the thread, and I have no idea where you got that idea. I thought about it, read the posts, and then made a decision. What more did you want from me?
Thankfully, I'm not a Kantian, so I have no moral reservations against that. I don't think I'll be taking that advice though.