Unless you're talking about a bunch of "born with sin" crap, then no, not everyone is bad. There are plenty of people who are good, and many many many times that amount who are at least "passable" and not a constant detriment to society like War Machine.
Also, it is VERY VERY EASY to choose Christ. That's why the lowest denomination of society constantly does so in prison. Furthermore, it is EXTRA EASY to choose Christ in prison, where there really aren't as many options competing for your attention as the outside world.
And yes, it IS like that. You're talking about how he "screwed up in the past" as though he is Morgan Freeman in the Shawshank Redemption, with this crap 50 years in the rear view mirror. He's been in prison (this time around) for what, a few months? This is his very recent past, and he has a history of declaring he's had an epiphany and turned shit around.
MMA turned his life around. True love with a porn star made him see the light and turn his life around. His last stint in prison made him never want to go back, so he turned his life around. He turned his life around so well that now he did a complete 360 and is right back in prison, where you have hour after hour in a tiny cell, a prison chaplain, a parole board that likes seeing people turn to the lord, and as many bibles in the prison as cell bars. Not hard to choose Jesus at all.
Yeah, it's like that.