Please read the article again. Then please show us where it says the men were (or could have been, or looked like they were about to be) fighting between themselves?

In fact it seems to state the opposite: Cpl. Sherrdean Turley, a spokeswoman for the police, said in an e-mail that although the two men were not brawling “they were intoxicated and weren’t listening to anything they were told to do/asked to do by the airline crew.”?

I would suspect that the 2 pax were not obeying the orders as to in-flight safety and security as well as annoying other pax, including the use of foul language or otherwise offensive behaviors - which can far too often come out while drunk. They could have been walking around too much, perhaps the flight was in or around turbulence so should have been in their seats with the belts for their own and other's safety. Perhaps they were disobeying the f/a's as to not get more drinks and may have pushed or shoved one or more with them. FA's have zero tolerance backed by their airline and the governments of the home country of their airline as to any assaults of flight crews. I would not doubt they were loud, annoying other pax who may be just trying to get some sleep or otherwise relax and didn't need nor should they tolarate such behavior.

It appears the situation was bad enough to take such action and I give support to AC in having enough guts to take the actions they did on these two fools.