I feel better about whether I'm going to get complained on when I allow anyone who wants access to have access. I never sit in the jump seat next to the monitor, so if we have a family member that wants to ride alone, that's where they sit.
I have done my time in an urban system so I totally get that nasty disruptive people don't get to ride, but now the vast majority of my patients and their families are just regular people, and with the hour long transport, even the slightly agitated ones have calmed down when I get a chance to explain what's going on, or if they misinterpreted any of my actions, I get to explain my thoughts to them.
The most recent family member who was very unhappy with us was crabby and mumbling as we loaded granny into the ambulance. She wanted to ride with, and I wondered if it was going to be a good idea. I went ahead and let her, got her seated and buckled, and started down the road. Granny was having a big CVA, so I had a few things I wanted to do for her, and then it was just monitoring the rest of the way to the hospital. The family member ended up telling me that she was scared at first because my partner and I looked like a couple of "17 yo kids" and she didn't think we really knew what we were doing. LOL, I took it as a compliment and she hugged me when I left her in the ER waiting room.
It's all in how you handle them. These riders are some of the best people to practice good customer service on, because they are the ones who are going to be telling this story to everyone in the grocery store, and you want to be the nice medic who took good care of granny, not the one who left them standing on the front porch, wishing they were with their loved one.