I don't think there are any sides.

He understands that there are valid transactions and there are invalid transactions.

Valid transactions belongs in the chain if they pay enough fee and/or if the one making the actual work (miner) includes it in the block.

If one wants to try to censor some valid transactions, only way to do it is to mine the blocks and not include the transactions they don't want to see.

Bitcoin is very simple in that regard.