I don't think it needs to be everyone. If we can think about 5% of the population who simply have different life situations and backgrounds having a better app

I don't think it needs to be everyone. If we can think about 5% of the population who simply have different life situations and backgrounds having a better appreciation for why they think what they do, and those 5% become less extreme and more understanding of compromising for the benefit of others, then you've just changed society completely.