People pass instant judgment on officers' actions on video without seeming to know anything about the investigation and analysis that necessarily includes policy, training, and the laws that govern police use of force.
In the age of ubiquitous video and mushrooming oversight, how can you ensure that your use of force does not bring unwanted discredit upon you, your department, and the entire profession? The same as always: Know the law, and comply with it.
Denying officers access to the video records of incidents before they write their reports serves only one purpose: It's a trap. The goal here is to play "gotcha" with the officers and try to catch them in a lie.