statements of the israeli police about this:

1. the victim was being arrested for drug crimes when this incident happened (not for a violent crime as far as I know).
2. according to the israeli police, the cameras on the 16 officers where off because of a "technical error".
3. the extreme violence applied to the the victim by the 16 armed officers was necessary to restrain him, because he acted violently.
4. the star-of-david-shaped injury was caused from the shoelaces on an officer's shoe, which means that at some point the officer's foot was either pressed hard against the victim's face, or they kicked the victim's face.

source (in hebrew, includes an image of some of the victims wounds and an image of the shoelaces)

I do find it beliveable that the star of david was unintentional (the actual shape, not the kick to the face), which of course doesn't make this case any more justified, but it wouldn't suprise me that much if it was intentional.