Narcissism maybe? It’s infuriating and really dissuades me from contributing in-depth answers here, which is such a shame. If I’m responding to someone I’m not just responding to help the person, I want to help anyone who might be searching for an answer in the future. It seems like a real design flaw that the OP can unilaterally decide to (effectively) remove an entire topic on their whim when others have contributed more to it than they did.