NCLN raises the issue.
In my experience, coming out as a pro-lifer can change people's opinion on abortion towards a more pro-life one.
That's not to say that it will make everyone pro-life.
But I have noticed, from my experience in social media, that if you just talk about fetal rights without being a jerk about it-- just talking from a point of view of facts and logic, it does bring people closer to the pro-life view.
Most Canadians have not really heard the pro-life view.
They've heard a lot of things about abortion. But not the full-blown argument.
There are people in this world who don't know active and conscientious pro-lifers. They believe what the media feeds them-- that we're all terrorists hellbent on chaining women to their stoves.
When they meet a pro-lifer, it shocks them, because they have a picture of an ogre in their minds, and you are obviously not an ogre.
You don't have to argue with them on the subject, although a polite conversation can help.
They can see how your actions contradict the propaganda. If they read your words on social media, they can see that there's more to this than reducing women to slavery (especially when you're a woman yourself!)
So it's really important to be pro-life in public. Not necessarily come out in every situation (having an abortion debate with your mechanic would show a horrible lack of self-awareness.) But where appropriate, it can definitely help to change hearts. I've seen it happen.