"He told me to 'kill it' in a serious monotone voice. I asked 'What? What did you just say?' He looked at me and repeated in a deliberate manner 'kill it.'"

That's an allegation about what Mike Bloomberg said to a pregnant employee who is quoted in "Bloomberg's sexist remarks fostered company culture that degraded women, lawsuits allege/Bloomberg allegedly told employee who had just announced pregnancy to 'kill it.'"

Did he really say that? He denied it, under oath and also while connected to a "lie detector."

But for the purpose of answering this question of mine assume he did or forget about Bloomberg and just answer my question as a hypothetical:

From the point of view of a person who genuinely and deeply believes that abortion is murder, which statement, made to a pregnant woman, is less odious: "Kill it" or "You should have an abortion"?

I'm thinking "Kill it" is less odious (again: from the point of view of someone who genuinely and deeply believes that abortion is murder). To say "Kill it" is to recognize that abortion is murder. Both "Kill it" and "You should have an abortion" are stated as imperatives and have the speaker telling the woman what to do, but perhaps the woman asked "What should I do?"

To say "Kill it" is perhaps a way to influence the woman to think about the unborn child as a real person whom abortion will kill. What's her next line? "I don't want to kill it. I just want to not be pregnant. It's not a good time for me now. I just want to have an abortion...." The line "Kill it" might ring in her head.

Now, in blandly conventional human relations in the workplace, I think if a pregnant employee asks the boss what she should do, he'd be wise to say something like, "This is a decision for you to make, and I will support whatever decision you make."

But I don't want you to think that I believe that if Bloomberg said "Kill it" it was because he wanted to stimulate anti-abortion moral thinking in the woman. I think that is less likely than: 1. He didn't say it, 2. He thought it was a funny, snappy way to give the advice he wanted to give (have the abortion), or 3. He knew the woman wanted to be pregnant and was doing a kind of outlandish teasing that's possible when you know you're among people who are entirely comfortable with abortion.