I won't advocate the destruction of ant colonies in forests because for ecological reasons, not because of individual ant suffering.
To me there are ecological and moral reasons why you should not destroy ant colonies. I am aware that not everybody agrees.
Regarding the drone strikes: whether videos of the strikes are also used for entertainment is irrelevant here, as long as it is not part of the motivation behind performing the strikes.
I don't think motivations factor into it at all. A death is a death.
I don't know what you are getting at here. Are you seriously suggesting that shooting people for fun is morally equivalent to shooting them for a good reason?