First off, I'll agree, dogs need to be well behaved if they are taken around other people, service dog, pet, whatever.
As to your service dog avenger routine though,
Has anyone told you to mind your business when you do this routine?
Folks get all bent out of shape over jack diddly now days, I think most are bothered that others use the system, frankly the airlines use the system too, everyone does, what's the old saying.. If you look around a room and you can't pick out the sucker, it's probably you.
Here's how that would play in my book
Is that dog required because of a disability?
Yes
What service has the dog been trained to do?
Services related to my disability.
Perhaps there is a guy in a wheel chair you could flip, maybe he's just looking to game the airline for that extra overhead space....
I know it's antidotal, but I've never, not once, seen a dog crap all over a airline, attack small children, attempt to hijack a plane, steal a purse, nothing aside from maybe a whimper or two.
Much like the drones, if you have so much extra time and energy to worry about someone getting one over on a crappy airline, perhaps picking up a new hobby would be a good idea, I mean really out of all the BS you get flying on a airline, this is so waaaaay waaaaaaaaaay down the list.
Why? If someone's dog isn't bothering you, why is there this need to 'avenge' a damned thing? For being the 'land of the free', it's the most over regulated snobbish place on the planet.