It helps people with glaucoma, helps cancer patients who are on chemo deal with pain and help them with their appetite and with MS patients if helps with muscle pain and spasms. For me it helps with my pain due to my arthritis and also helps me with my appetite because I have a hard time eating sometimes because of the pain I'm in and I need calories or else working out is pretty pointless.
It has a lot of medical benefits.
Very valid points, not for EVERYONE, but for many people it helps solve a lot of problems and make life easier.
As I said before, I don't smoke weed nor do I ever want to as I currently am. But I agree when you say people can be very ignorant about it.