Experimentation with society requires risk taking and uncertainty. Of course no one wants it.

What if someone came up to you and said "hey we're going to put your kid into a new type of experimental school. We think there's a a 50% chance we can save money on education but there's 20% chance they'll be severely undereducated. Btw, you can't opt out because that would mess up the integrity of the randomized selection process"

That's some dystopian level shit