Don't let your lack of experience stop you. If it's something that seems like it'll be dated before you can finish it, I'd recommend making it fiction that incorporates those ideas without necessarily having them be the entire focus of the book. That way you'll have something that can at least potentially outlive the expiration date of the social issues themselves.
Share a tiny amount of it that you may eventually edit a bit to make less recognizable or publish under a pseudonym.
The real trick is trying to do it correctly. A lot of modern writers use a tragic past as a crutch for lack of creativity or skill. Kinda like Rey in the new star wars movies.
I find that pretty cool; a villain, let alone a monster, must confront his past to become a valiant hero.
A good example is Joshua Graham from Fallout: New Vegas. A monster humbled by defeat and fire who struggles with his demons every day.
I might have to disagree a bit. A main character can be loyal and selfless enough to give their life for a stranger. You see plenty of that example in real life. What I think matters is how they're written. Are they fun or interesting to be around with, just so happen to be a jerk with some bit of heroism, or the bad case being devoid of any personality besides being "the good guy"?
That's why I rather go for fun than preachy. Even in the fun, anything interesting can be shown. When it's preachy, it sucks away your investment in exchange for needless personal views of the author.
