I think the difference between Colgan incident and this incident on the Republic AC, is the door was closed and aircraft was being operated by Colgan, under their certificate issued by FAA. The accident was attibuted to Colgan's operational and training pricedures.

This case, not so; the entire process was under the control of UAL's CSA personnel right up to the customer being dragged off the plane. The only saving grace for UAL might be to argue they called the Chicago airport police personnel to do their job, and they had an expectation that it would be handled professionally by the same.

But I think it would be grasping for straws to blame this in any way on Republic or their crew operating that aircraft.