you should consider that maybe your questions are more posturing than genuine helping.

Yeah, that's close to the impression I've been getting from instances of such.

That question is simply a good general question to ask, and one that people can easily forget to ask themselves.

And if you really think, if the conversation so far is really indicating, that someone is forgetting to ask themselves this question... then sure. But when someone says, in so many words: "I deliberately, by choice, do X" — how likely is it that they've just forgotten to consider what good it does them? It seems to me that if you break out the "but what good does tha really do you?" inquiry in such a case, then you are being condescending.