If the US government obtains 70% of hashpower and use it to mine mine empty blocks, effectively censoring
the users of Monero. Would you like to pay the government 0.6 XMR for every block in which you were not able
to transact? I think that the majority of users wouldn't like to pay a dime for censorship.

Emission of new coins should only be the means of permissionless distribution of coins and thus should last for a limited
number of months / years. It is a fallacy to claim that it ensures security.