>> It looks more and more like these deputies let their anger get out of control with this guy
Stubborn + stubborn = trouble.
The deputies were right to prioritize their safety, but by wrestling Mr Pocket Pool to the ground, it’s seems the risk of trouble was increased substantially.
The deputy could have drawn his sidearm, have his buddy help detain Mr Pool with cuffs, then give Pocket a timeout in the back of the patrol car.
And what if Pool refused to comply with a drawn gun? On another thread, it was posted that this guy has a long history of bad drunken behavior, including DUI, going into another person's home and getting arrested for it (which implies he wouldn't leave when requested) and trying to divert traffic when drunk. He also called 911 on one occasion to report a werewolf chasing cars, which implies that booze ain't the only thing he's injesting.
In other words, he is an out-of-control idiot who is probably too stupid to realize that a drawn gun on him is a very serious matter.
I went to the trouble of finding the entire, unedited video and watched it and transrcibed it. From what I could see, the moron escalated an in-control situation by being his usual idiot self by taking his hands out of his pockets and then putting them right back in - repeatedly - which is what got him tackled in the first place (a detail edited out of the TV news video linked above). And then it appears he continued to put up a struggle for nearly 15 minutes - and it also appears a deputy took a blow to the head, as he leaves the scrum and then later is seen holding a towel to his head as if to staunch bleeding. And then the idiot (true to form), stripped and handcuffed, refused to roll over. That is when he got tased. After that point, I think the kicking and clubbing was not to subdue him but instead was the cops taking their anger out on him, and that is when it because excessive, and it might well have been the case that the initial tasing made him unable to roll over, making subsequent tasings just punishment - however, given that he had failed to comply to any request to that point, he pretty much set himself up for multiple tasings AFAIC. And the beatings and tasings in the jail, if true, are even worse, because the sheriff was involved and the cops would have had time to cool their anger - but instead carried it over.