There are too many animals on the planet and some need to be removed.
Are you saying you want to get rid of some animals by killing them?
My girlfriend might like that idea, but she's a sociopath.
It is unacceptable to consider killing off a large portion of the animal population. People that consider such things are unusually cruel or devoid of normal feeling.
I think many, if not most people, would agree with me on this. If a newcomer to the earth wanted to kill all mammals of some type, that would be acceptable to those on the earth who are dominant. It's all about power and domination.
Animals are sentient beings that have the right to be here, just as much as we do. It's not our place to decide whether they should or should not be alive. Why not have empathy towards all creatures?