definitely agree with the idea of not wanting their transactions censored, but that is the case whether El Salvador mines or not. the only befit to them mining is if they have access to cheap power that can provide them more Bitcoin than if they were to buy it directly (accounting for other intermediaries, convince/complexity, etc.). in that aspect, it's just like business. or at the least, very analogous.  

 unless you control your own hash power, you are engaging in a trust-based system where you trust miners to include your transactions in the block, period.

El Salvador.. as the first country deeming it legal tender must mine their own blocks to guarantee they aren't censored for any reason.  This is not disputable.