@Here's another crystal clear example
Not a very good comparison. In the first video, the man in the truck was loud, belligerent, angry, and vocally abusive -- but he followed instructions. Ungraciously, to be sure.
In the second video the man was quiet and seemingly calm but he refused to sign the ticket. The ticket is not an admission of guilt, just a guarantee that he'll show up to court (or if offered may pay the fines). It's an acknowledgement that he received the ticket and understands his options.
If he refuses to sign the ticket, his alternative is to be placed under arrest. (Heck, they covered that one in an Adam 12 episode 40 years ago. This isn't news.) This fellow refused to sign the ticket, so the officer attempted to place him under arrest. The man continued not to follow instructions.
I'd say the officer did pretty well considering he had to deal with two uncooperative civilians, one being hysterical. (Had that been my wife, she'd have sat in the car the whole time rolling her eyes at my obstinance and thinking what an idiot I was being.)
Would this have have happened differently without the taser? Yeah, probably the cop would have gotten more physical. Possibly with a nightstick. And I still would have very little sympathy for the guy who couldn't follow simple instructions.
There are a LOT of examples of police using excessive force. I don't think this is one of them.
Are there good arguments for eschewing tasers? Yep. This isn't one of them. Try again.