Animal abuse is wrong because it causes gratuitous pain to the animals involved. That is enough in and of itself.
Human cloning is being perfected, we are already engaging in embryonic experiments into genetic engineering, and there is a great silence.
Of course Manson acolyte Leslie Van Houten chose to kill, just as millions of law-abiding people choose not to kill.
The Planned Parenthood prosecution of David Daleiden and a colleague was a particularly egregious example of this authoritarianism.
Democratic VP pick Tim Kaine and Brown University biologist Ken Miller have this is common.