I've used Joy occasionally if I ran out of detergent and absolutely needed a small load of laundry done. I can't say I saw either better or worse results (but do we ever really know how much we should be using for any particular size load?). Nothing I've ever washed on an emergency basis has been all that obviously dirty-looking, and it came out clean enough.
As for the "extra thought" about people "breeding without thought of consequence", I'm not sure if you're talking about people having lots of kids or having kids at all; but there's no doubt about it, if people stopped having children the human species would eventually die out, and the world would be left to plants and others creatures.
I think, for the most part, detergents are detergents (at least those made without regard for the Earth). I don't think it matters if they're bottled as dish detergent, clothing detergent, or even cheap shampoo.