It would be foolish to assume what you see cops doing on youtube, buzzfeed, or facebook represent what cops do everywhere.
Of course it's not the same everywhere.
But consider that much wrongful cop action is never
recorded or documented. So youtube shows the tip
of the iceberg...especially before the age of ubiquitous
cameras. It's a problem worth addressing regardless
of how many civilians are abused, injured, & killed.
Consider the case of Daniel Shaver. The cop who
executed him after a game of Simon Says was found
not guilty. His department said he performed his duty
as he was trained. If this is how they're trained, then
training must radically change.
BTW, to murder people can be hard on the cop who
does it too. Shaver's killer retired early with full pay
on medical disability due to the stress of executing
an innocent man.