"clearly"
because something is now missing....
just a wee little bit of assumption in there yes ?
Maybe some store employee hated the cop and "accidentally" deleted the video ?  Maybe The police picked it up, put it on a thumb drive and then sat on it and broke the thumb drive ?  Maybe it got given the same level of "priority" as the over 1,500 rape kits and just stuck on some shelf someplace and forgotten where it went ?

Stop making assumptions. Seek the facts and find truth before you toss out a biased opinion.