Boy, what was next?  Shoot him and remove the body?  What's the next level above minimal force?  After a recent sardine flight with a Canadian airline for which I paid almost 20% additional to the ticket price for the "privilege" of booking seats and carrying baggage, I have absolutely no sympathy for either the airline(s) or, in this case, the police who were carrying out instructions from United.  They had no business getting on the aircraft; Mr. Dao committed no crime.