Instead of going on pure emotions, let's be reasonable about this.
These police officers probably didn't want to tazer the kid. The dialogue leading up to the decision probably didn't sound like, "Eh, I'm too lazy to wrestle this kid", "Yeah, me too, wanna taze him?" "Yeah, okay."
Nobody here knows the exact situation, but common sense seems to dictate that police officers in this situation were probably trying to make the best decision possible. Besides, if their parents felt the need to call in the POLICE to restrain their child, I would guess there is a LOT more going on than what was reported -- Police officers aren't paid to wrestle and fuck around, they're not paid to be parents, they're paid to protect people. Yes, it seems a ten-year-old shouldn't be much of an issue, but let's use some logic -- if the kid's parents felt the need to call police who in turn felt the need the act...I highly doubt this was an ordinary istuation.
Furthermore, insinuating that you could do a better job is basically boiling it down to, "I know better than a trained cop with more experience than me". I get the same attitude at work when people think things are easier than they look, I've done art commissions for people who think they know what I'm doing better than I do, and frankly, in about 98% of the cases...they don't.
Maybe it was a mistake, maybe not -- there's much more to the situation than any of us are aware of though. Before you cry for these guys to be strung up and fired or whatever potentially unnecessary aftermath you find appropriate, consider that you may not have had a better solution if you were standing in their shoes -- unless, of course, you are a veteran on the police force.
edit: also: "don't taze me bro".
If laughing at that quote in this situation makes me wrong, then I don't want to be right.