I think it boils down to free will. God gave we and his angels the ability to determine their own fate, including whether to do good or harm. Apparently He didn’t want to populate heaven with automatons. When they say abortion is a choice, of course it is; a wrong one.
God gave His angels free will to determine their own fate....hmmm. There's not much in the Bible about the free will of angels or their determining their own fate. Mostly, I think, it talks about one angel: Satan, the Prince of Darkness.
Good angels, I assume did and still do good and, then, conversely bad angels did and still do bad. No automatons there.
As for abortion being a choice, a bad one, I'm with you there, 100%.