Thank you, Mangetout for your tenacious defense of logical debate.
The offense you mention is one that also CHAPS MY FUCKING ASS. It displays a retarded disregard for premises, and I daresay, logical entailment.
If I start a debate on: “If I trisect an angle with straightedge and compass, will I be famous?”; it’s pointless, nay abso-fucking-lutely lacking all semantic content, to point out that I can’t trisect the angle anyway.
In logical terms, we’re debating a counterpossible conditional. Oh, don’t worry, I get your point: the question doesn’t matter. But you’re wrong. Consider:
“If I found a way to trisect an angle with straightedge and compass, would I become a famous mathematician?”, and
“If I found a way to trisect an angle with straightedge and compass, would the Detroit Lions win the Superbowl?”
It is an impoverished logical worldview that pretends that those two questions are equivalent.
I mean, fuck, people, fuck.