Whatever the rights of the airline company.
Really does any one honestly believe it is the best & right thing to do is to
Forcibly drag off a plane an all ready seated & luggage stowed passenger 
(man)of 69 Who was not causing any kind of issue - They Broke his nose knocked 
his Front teeth out & he suffered concussion !!!
How would all of you who are sticking up for the airline / cops react if that 
Was your father / Brother.
I'm sure you would all say - Well he deserved it.  

There were far far better ways to have remedied the situation that united airlines 
Had caused themselves by suddenly having the urgent need to transfer 4 of their 
Own staff.
The mere fact that the CEO has completely changed his tune & is jumping through
More hoops than a performing dog clearly indicates It wasn't the Right or Best thing to do.