If you invest in a broad, market-based index fund like VTSAX, then you’re already diversified. Including real estate. Investing in the total stock market (which is what VTSAX is) also includes investing in real estate companies, automatically.
Investing in real estate beyond that would actually make your portfolio LESS diverse, overweight on real estate relative to the market.
As for the moral aspect, stop trying to cope. Either admit that “this is immoral but I want to do it anyway”, or admit “this is not immoral”. You can’t have your pie and eat it too.