It isn't belief in bigfoot that matters. Most of them don't believe anyway. What matters is having scruples.
On woo fora you will find a happy home for lying, defining words to suit your whims, diversion, evasion, selective memory, denial - every little tactic of dishonest interaction with others.
The game is about power and control. Button pushing, for example. The "no true skeptic" fallacy is used universally by 'footers and also by faux-skeptics just trolling on this forum. No true skeptic would doubt the possible existence of bigfoot. The true skeptic is 100% certain that there is a possibility. lol.
Don't make the mistake of sincerity in the position tendered. Instead, think duper's delight: The more frustrated someone can make you in dealing with the tactics, the more delight they enjoy.
Someone above pointed out the fundamental unfairness at work in the argument that's got the buzz going. Well sure, that's the whole point - playing honestly and above-board is too much work. Playing dirty is easy. My manipulative old college room-mate used to say "if you ain't cheating, you ain't trying."
You store in your mind which dirty tricks seem to work best with people. That's how you classify them: Use shaming on bill. Use false flattery with Sally. Use guilt-tripping on Sam. Play the "no true skeptic" fallacy with skeptics. Get them angry with defining your own words, but do it in a way that makes it plausible you actually believe the words coming out of your mouth.
It isn't baffling to me at all. Bigfoot is a platform to operate from, not a belief. It's a con game. People with scruples are eventually going to leave 'footery if they fall into it by accident because the conscience cannot permit being dishonest about what you say you believe.
But a person who is a con man at heart can "give up" a belief they never had in the first place to take on some new role. Nothing has changed in terms of what is important interacting with others.