I agree that people should have the freedom when it comes to whether they wanna select a BA or not, but I feel like it's safe to *assume* that selecting isn't against their will in certain situations. If you look at Set 2, you'll realise that it's never confirmed that selecting isn't against the person's will. We might very well be selecting against it without knowing that -- we can just assume that we're not. In the slight chance that they don't like the BA and return to the site, they might have a problem with that. But the chances are so low that we can ignore that possibility! Similarly, I feel like a positive response from the OP + an answer which completely resolves everything, are enough requirements met to safely assume that selecting the BA isn't against the OP's will. Because at the end of the day, they can just deselect the answer if they don't like it -- they're not gonna leave the site just for a simple answer we selected for organisational purposes!
I don't really get what you mean in the 2nd part lol. Would it be too hard for others to understand the conditions?