Since when have people ever learn shit? If someone is dead set in their opinion very rarely will they admit they were wrong, they'll shift the blame or act like they never held the opinion but they by and large most people don't learn from hardship.Honestly I'm here now , sometimes it's hard lessons that get people to learn
Look at WW2. The still people alive that fought in the war and plenty have parents who were effected. Nazism is back on the rise however. Does that sound like people learnt shit?
Your far more likely to convince someone about something they're neutral or have opinions on one way or another than someone dead set on something regardless of the consequences.