Knott's can do that because they know who to go to in order to make it happen, and leave them looking like the greatest thing since sliced bread. It's an evil ability to slowly destroy everything in their path, while at the same time projecting the illusion that they are the greatest thing going.
I've seen fellow ride operators start out having fun with the guests, making their job fun, and management clamp down on it and say, "Don't do that anymore." Seriously, there was a guy and a girl working Balloon Race in Camp Snoopy, and I watched as they joyfully helped the guests on the ride, get their belts on, checked everything, launched, then helped the guests out, cycle after cycle. Then one of the shilft leaders noticed it, and told them to stop doing that! And the guests were having a ball, too, until that couple were forced to stop having so much fun! Total killjoys run that park, for sure!
Knott's has had run-ins with disabled people; there's an account on
http://www.themeparkinsider.com how a family with an autistic child was told they couldn't take their kid on hardly any of the rides, and gave lame reasons for doing so. When they went to the rides office to speak with a manager, they were told that they (management) didn't care about their problem. They got that on tape. Plus, when they tried to get a snack from one of the carts, the employee working the cart claimed she was unable to get them their soda because she was too short to reach it!
Another guest rode Ghostrider, and broke her neck due to the roughness of the ride; when she tried to complain, Knott's claimed she'd entered the park with her neck already broken and had chosen to ignore the warnings at the ride! There have been other cases where guests have gotten whiplash injuries on Ghostrider, and the park claimed they weren't actually injured, or insisted it was the guests' fault!
One of these days, somebody's not gonna take that crap anymore, and it'll end up on the news bigtime!