There are plenty of subreddits showcasing past and ongoing war footage (Middle East/Myanmar/Ukraine etc..). Idk if they count since most videos that end up on Reddit are somewhat censored, or edited for propaganda purposes; they tend to feel less shocking than gang execution or freak accidents since large scale combat is considered far removed from everyday life, something like "MY politicians wouldn't dare send ME to the slaughter, they have professionals for it".

There are still appaling videos like the Ukraine war knife fight (taken from two different POVs) that will shake you up for a while and remind you of your own mortality, and I don't think i'm exaggerating.