I do appreciate people like you, but I think too many people EXPECT people to still give them the other role just because they are polite. Not saying that was your point. Just too often people "pretend to be polite", then if you say no, they get super annoyed that they had to be polite AND you said no.
Me personally, if I got my role, I'm playing it. If I wanted support, I'd have played it, or...I just got autofilled myself. It's good to be polite and ask, but I think people should just...suck it up in this case. We all get autofilled, you can't help it unless you main support (even then I've somehow gotten autofilled even putting support, so...who knows).
The dodging thing just annoys me, cause now multiple people's time is wasted, and all the dodging did was put them with a dodge penalty...and they are still autofilled so what's the point?