Deleting data according to a pre-defined schedule (often 90 days) is legitimate and standard. It's good that agencies do this, to limit exposure due to data breaches. And it's normal for courts to issue a preservation order for specific data relevant to a potential case.
It'd be better if the courts could actually deal with the case now instead of in 1-5 years, but alas.
> This chart includes categories for how long video is kept if it does not contain evidence of a crime [emphasis added]
So yes, some things are short (I did write "usually" for a reason), but even your link doesn't claim that video of a killing would be deleted in 90 days. It's evidence, 90 days would be ridiculously short for retaining evidence.
Even for people who don't think the ICE agents committed a crime, the ICE agents and DHS have claimed that this was the outcome from actions by a "domestic terrorist" which certainly makes it evidence of a crime from their own perspective.
The agencies in question are unlikely to face any accountability. The agencies that would typically investigate something like this are no longer independent and, instead, are headed by feckless Trump loyalists. It doesn't matter whether it's legitimate, it matters whether it serves their ends. If they cared about process or the law they wouldn't have been labeling the victim a domestic terrorist within minutes of ICE agents murdering him.
Dissolve it and DHS. Investigate every single ERO agent and prosecute those that meet the bar. Bar all of them from future public service. Prosecute agency heads.
Sounds like federal government employees blocked access to the crime scene to state and local government employees. Presumably, this “order” is to help facilitate access without violence between federal and non federal government employees.
It'd be better if the courts could actually deal with the case now instead of in 1-5 years, but alas.