Re the second video, what I see is that at 0:33, the guy they're chasing starts to step out of the vehicle, and a police officer just whips out his baton and whacks him, unprovoked; and was about to whack him a second time when another officer intervenes. Furthermore, it looks like officer with the baton keeps looking for more opportunities to hit him as he's wrestled to the ground, and is only prevented by the fact that the guy is being mobbed by other officers.
EDIT Also, around 1:37 it looks like someone kicks him when he's lying on the ground, and at 1:45 someone punches him when his hands are cuffed behind his back.
That looks like an example of unnecessary force to me.