Why do people feel the need to piss on a question...revisited?

This was asked almost a year ago, there may have been similar ones asked in the meantime that I couldn’t find, if so, sorry. In the last few days, two Qs in particular come to mind as examples. One was a light hearted Q that referenced astrology, and the other was a Q from a person of faith asking about a very specific point dealing with that faith.
Nowhere, in either question does the asker state that they want to debate the validity of their premise, but in both Qs the entire response field is filled with off topic posts refuting the belief in God, or saying astrology is bunk.
My basic question here is WHY? Do you think that the asker will stop believing because you say so? This is indeed a bit of a rant, but I honestly, honestly don’t get the point. Please enlighten me if you truly believe that you, as a stranger on the internet, can change someone’s mind by not answering their Q? Why not simply stay away from that Q?