That's probably the biggest difference between you and VCs in the biz today. These ideas actually sound so legitimately like they could be funded today, and make mad bank while at it too. And that's all "normal" VCs care about, so there you have it.
The investors who do the stuff that I suppose one would call meaningful tend to be investing their own money or their friends' money, or it's a slice of a regular fund used in a way similar to corporate donations. Plenty of VCs do care about tech and meaningful endeavors, but that has to be secondary, unless they are playing with their own money.
There seems to be a lot of misconceptions about what the business of investment is, when it comes to venture capital, for some reason. I've spent enough time around the activity and the people that I can see what it is and the logic of it. I don't really like it, but then I don't like a lot of things in our culture.