I think lemmy is a lot less averse to users posting their own content as long as there is a proper summary, it isn’t a youtube video and you disclaim it. I would also avoid cross posting.
Maybe you can message the mods of a few communities ahead of starting to post just to be safe.
A community is also a good option. Pretty sure you can make it so only you can post on a community so it ends up filling in the same functionality.
It most likely won’t be shared since Israel has a history of letting these attacks happen so their slaughter of innocent civilians can appear justified.