it sounds pretty justified here. If you're trying to hurt people, you deserve to get tasered. You keep trying to resist, you just get tasered more and more until it's safe to handcuff you.

no tasering incident is worse than the one that happened right here in my airport (Vancouver) where a newly arrived Polish immigrant, who was getting increasingly agitated (no sleep, zero help from the immigration officers), got tasered to death by four cops (who are sadly keeping their badges). Witnesses said the Polish guy wasn't trying to be violent, he was throwing chairs around to get attention to his plight, and basically everything was a complete mistake.