The 3 kicks, No, they're trained in other methods. I just understand that all humans have limitations and sometimes loose their cool when under extreme pressure. We shouldn't expect police officers to be perfect. Who knows what they've experienced or are going through on and off duty? There are too many unanswerable questions. Does this officer have a record of doing this? This is 57 seconds of a long night, we can't judge a whole police force or what we see in this video based n that very short clip.
What would we be commenting on if the video was about the two or three guys kicking the s#$t out of the guy who's out cold on the sidewalk? Would we say "Jeez the cops should pull those guys aside and be gentle but firm while arresting them?" Nah, we'll be thinkin' I wish someone would kick the S$%t out of those 3 guys for putting the boots to that poor guy who's out cold.
As I've just done, it's all speculation. 57 seconds. Nobody can make a sweeping judgment on this with an edited clip showing one officer throwing 3 kicks. (to what looks to me is their arms so they would lay down, but hey we all see what we want don't we)