MJ is "totally legal" in Washington. And there is no stigma among the many banks lending money to dispensaries. It does not make sense to me that a payment network is making my moral choices for me.
Having said that, I have much respect for Tony.
Has nothing to do with a moral choice, regardless of state law marijuana is still illegal federally. Until that happens you are unlikely to see banks and or payment processors deal with dispensaries simply due to the fact that it's illegal federally. Same reason you don't see actual pharmacies in legal states selling medical marijuana, since it's illegal federally and pharmacies receive federal licenses to operate they won't get involved.
Are you sure banks are loaning money to dispensaries ? Banks haven't been working with dispensaries for quite some time due to federal laws and pressure from the federal government. All the dispensaries I've ever dealt with were started up with their own money, not a loan from a bank. Actually I've never heard of a bank giving out a loan to start a dispensary that's illegal on the federal level.
Hopefully sooner than later federal laws change, because this really is nonsense that people vote for something but business owners are still punished and treated like criminals.