If you're going to text words like "abortion", you should probably care enough about what you have to say to not need the autocorrect. For most of us, that's not a casual conversation kind of word that you just dash off quickly while you're in line at the grocery store. There are probably a few people who use those terms frequently in their day to day conversation. People who are deeply involved in abortion related causes or abortion providers might use "abortion" daily. People who are avid hunters or gun activists or sporting goods salesmen might use "ammo" and "bullet" all the time. But for most of us, they're not such a common part of our conversations that we need them autocorrected for ease and speed all the time.
If your friend gets a response to her text about when you're going to be coming over and it says "In a couple of hours. I'm busy getting an abortiom.", her response isn't going to be to the misplaced "m", it's going to be toward the content. If you're having a politically charged conversation about abortion, you should care enough about the ideas you're sharing to spend a second proofreading before you send. If you can't be bothered to spend a second checking it, it's too lame and careless for anyone to spend their second reading it.
I can also see it helping keep folks from unnecessarily getting flagged as terrorists or criminals. I'd hate to have it autocorrect so that it sounded like I was loading up a bunch of ammo.