There are no guarantees of course, but I am fond of saying “it’s called space for a reason.” There is so damn much of it. Go find one of those “solar system to

There are no guarantees of course, but I am fond of saying “it’s called space for a reason.” There is so damn much of it. Go find one of those “solar system to scale” models. Anyone with interstellar capability could definitely go somewhere else. That doesn’t guarantee they won’t be assholes but it means it’s unlikely that future spacefaring intelligences will be pushed into an aggressive position by scarcity of land or resources. They will at least have the option of just going elsewhere. Personally I think large scale space conflict for rational reasons is unlikely both because of how costly it could be (any spacefaring being has ludicrously overpowered WMDs) and the optionality. So if it does happen I would predict it occurring for irrational reasons. That happens of course.