What if the dollar collapses?
Forget about some assumptions, each currency is independent on it's own, one cannot stand against the other for now, I don't also think there's anything to make the USD collapse if it has not been into this all this while, Bitcoin and Dollar can both exist now together till one turn to become the mainstream for use and adoption and yet they can still both exist together and one is more preferred to the other.
How will Bitcoin thrive amidst crises?
Bitcoin doesn't have to go through all these, the network protocols are set for it to thrive all situations it may pass through, the reason why it's decentralized, we are the ones to rather thrive more towards it's adoption by not having government restrictions on us from adopting Bitcoin.
Can Bitcoin liberate itself, embracing a humanity free from financial tyranny?
Why do you think many were after Bitcoin adoption all over the world, it's because they have identified the liberation with bitcoin and would also want to be liberated along when they adopt it.