https://www.ptsd.va.gov/understand/what/avoidance.asp

> A combat Veteran may stop watching the news or using social media because of stories or posts about war or current military events.

https://www.verywellmind.com/ptsd-and-emotional-avoidance-27...

> The avoidance cluster of PTSD symptoms involves efforts to avoid distressing memories, thoughts, or feelings, and external reminders like discussions about the traumatic event or encounters with people or places associated with it.

I don't see how specifically avoiding content that contains triggers is anything but avoidance behavior as discussed above - avoiding the news or discussions about war is pretty explicitly facilitated by TW - before the clip plays on the news, by people posting it at the top of their social media content, etc. And media with the content would fall in line pretty explicitly as an "external reminder"

Like, I don't think someone who has been physically tortured and dealing with PTSD should watch Hostel or other torture porn, and I don't think a vet with PTSD should watch a compilation video of some of the worst horrors of war. So I'm not arguing for massive exposure or intentional forced exposure, etc. But the fundamental issue is that going out of your way to prevent yourself from being exposed to it at all, which is what TW facilitate if they were to work, is pretty definitionally avoidant behavior.