or would it lead to centralization, censorship, and control?
Yep this one.
There were few cases where miners censor specific transactions, imagine if big pools are belong to government, we might see they will censor any transactions related to mixer, unauthorized exchanges etc.
https://www.nasdaq.com/articles/mara-pool-and-bitcoin-mining-censorship-2021-05-07OFAC-Sanctioned Transactions Being CensoredCould we see mining wars in the future, where countries compete for hash power just like they do for oil or nuclear weapons?
If government only increase their hash power without destroy other miners, it's a competition.
I would say it's a war if the government attacking other miners, which I think won't happen.
Would you trust a Bitcoin block validated by a government miner?
Why not? they only able to see our address and the amount we receive/send.
Could this destroy Bitcoin’s neutrality?
Yeah if we talk about decentralization. If we talk about price, it won't make Bitcoin price down.