It's amazing how these songs helped in a way to shape the world which we now live in today but it also sad that most artists don't go with these kinds of song today. Everyone wants to stay safe, keeping away from the "threatening" songs but as you said, there could still be a few writing and singing such songs in the background, maybe their talents haven't just been discovered or people (producers) that have spotted them think their songs are quite "aggressive".
These people back then wrote songs out of their heart and sang with passion and love for a better world, which worked but I believe there are times that we still do need such songs...
Yes, I think everyone in the music industry wants to play it safe these days. And you're spot-on that these songs helped shape the world we live in today.