I'm not sure why you'd say that. Cops kill pretty much anyone they want with impunity now ga teen killed and coed killed by police and police cadet killed by instructor etc. to list just a tiny sample.
If you or a family member is killed by a cop there is essentially a zero chance that the cop will be brought to justice for it. So again I ask how do you think it's different here?
When heads start exploding at TEA Party rallies... then we will have become Venezuela. I am not discounting what you say but there is a difference as of today.