Turning off a bodycam or deleting video footage in order to hide a non-justified shooting, assault, thievery, etc. are NOT official job duties, thus meaning that it is a personal act, the officer’s own personal azz is on the line, and as a result, they have 5A protections. Govt. agencies’ and employees’ official acts do not have 5A protections. Ike did an EO that said if an exec branch govt employee invokes the 5th while testifying as to an official act, they shall be fired immediately. That EO is still in force today but FJB’s minions do not enforce it (they’re so smart (/s) they probably don’t even know it exists or that it has never been countermanded by further EO’s.)
What about when the ATF advises that bodycams be turned off prior to a raid in which the suspect was indeed shot and killed?
Regardless, even if you are correct about the law as it is presently applied, I disagree with it and would not extend these legal protections to government agents who commit crimes, or even who pointedly act to conceal their actions while on the clock - they deserve to fear the consequences of wrongdoing while in uniform, because they certainly get a lot of compensating privileges while in uniform.