Where did I say he should challenge for the sake of challenging? The only comments I've made regarding that were hyperbolic ones where we at least know he's awake.
My argument has always been smart challenges. You've come out against this because I've been railing against the fact that not only is he not doing smart challenges, he's doing no challenges. And he misses those opportunities (as you've said above). I also haven't advocated using a challenge every single game. But I have advocated using them at any point in the game where there's a call, because as is patently obvious at this point, 'saving them for later' is a pointless reason to not do a challenge because there never is a 'later' where we decide to use them.
I'm not certain where I've said he should do things that hurt us unless you're reading me strictly literally. I think there's an element of risk, sure, but I also think we should be putting in to context exactly what "hurting us" means. It means you use your timeout then instead of later, and you have to then budget the rest of your timeouts around it. That's it. If we're defining "hurting us" to mean that then we don't have a challenge to use later, well, then... that's kind of an odd circular argument.
You consider it a victory in this thread when a coach challenges and fails. You also gave two specific examples of situations where Quin would challenge for the sake of challenging that you would be happy with. When failure is a victory, it is no longer about trying to help the team win.
I'm also on the other side of the fence as far as "backing up" your players. When this was very young team, Quin didn't want his team to complain about calls. That has waned over the years, but I'm still glad he did it. I can't imagine how much Rudy would complain if Quin let it fly his whole career. I really do not think having your players believe that the refs are out to get them is a good thing. There is no field of work or study where people improve by deflecting responsibility.
That second part is a gut feeling, but I really don't see why basketball would be different from anything else. If anything, it's more important for basketball players to control what they can control and not let their egos take over.