Is it okay for me to be giving high interest rate loans to right-wing clients?
Why would you give higher interest rate loans to right-wing clients?
Because those right-wing clients never have any problems paying their loans!
It is a crime to give people higher rate loans based off their political opinion and might be a crime. If people pay their loans you should offer them a lower rate.
I'm a right-wing and I can't stand you left-wingers.
I am not sure on the legality of what you are doing, but it sounds morally incorrect. Regardless of how much your clients are earning, you should try to treat them all equally. Exploiting a customer's situation would not go over well if they found out.