At the very least you can try to hold the bad actors accountable even if it's years if not decades afterwards, if you have documentation. Germany for example had deathcamp criminal cases being prosecuted as late as 2022 [1].
It will get really interesting what happens in the US once the Trump administration is gone - even if the expected Trump pardon against everyone involved gets reversed somehow, I suspect that a lot of material regarding ICE or the military strikes against "drug smugglers" will simply have been shredded or never been created in the first place...
[1] https://www.deutschlandfunk.de/die-letzten-ns-prozesse-in-de...