IDK about OP, but tons of people would post something like this because they're struggling with such issues. Plus if platforms start disallowing such content, you likely also won't be able to discuss it in a serious manner, which is a huge problem.

As a disabled gay furry satanic guy (cis so no bingo, sorry I know I've failed you all :p) who struggle with suicidal ideation (and several friends who do as well), while the thought is nice, we all laugh at pictures like this. If we were going to do it (which several have tried, a couple multiple times), it's not the dark humor picture that's the tipping point. If anything, in my experience, the dark humor helps by bringing trusted friends and community together, instead of forcing oneself to believe that they are alone in this shitty existence we call 'life'.