Why do you guys so vehemently commit to buy and hold, only to blow it when it's at the very bottom and sell?
Not all of us do that

When I say I'm holding, I'm holding. I'm not dumb enough (nor good enough) to attempt to sell at the top and buy at the bottom, it's a fools game.
Then you have balls of steel or enough money to not panic. The idea is you want to stick to buy and hold, so put yourself in a position where you won't feel the need to abandon your plan because you need to pay your bills or whatever. If you can buy and hold without panic even without having taken that profit first, and that's what you want to do, then my advice would not apply to you.

Well it's mostly just because I've been around Bitcoin a long time, and I've been through this several times already. After the second "crash" I find it just doesn't worry me as much anymore. I have faith in the protocol long term, so the odd day/week/month of the price dropping or languishing doesn't really faze me.
Plus, I have a solid job and I'm not particularly in dire need of cash, so yeah that helps