the miners become transaction validators that can be compelled to censor certain kinds of transactions by their government
That's only true if
1) >50% of the miners are in said county (currently China)
2) >50% of the miners agree to this censorship
3) They actually know the meaning of transactions in order to filter them. Most transactions are anonymous, even the big ones. We know identities of a tiny percentage of the addresses, and most of them are not hiding. For instance, we can't figure out where Mt Gox money went - I've seen some attempts of tracing them, but it went nowhere.
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That's only true if
1) >50% of the miners are in said county (currently China)
2) >50% of the miners agree to this censorship
3) They actually know the meaning of transactions in order to filter them. Most transactions are anonymous, even the big ones. We know identities of a tiny percentage of the addresses, and most of them are not hiding. For instance, we can't figure out where Mt Gox money went - I've seen some attempts of tracing them, but it went nowhere.