teaching your kids that the earth is 6000 years old, evolution is a lie to turn you from a magic sky man, global warming is a hoax to kill capitalism and that all people who don't believe the exact same as you need to be converted or spend an eternity burning in agony is harming your children.Unless the parents are harming their children I'll defer to their choices for their kids. My default setting is to let people make their own choices and reap the rewards/detriments of those decisions.
same as if you use those vouchers to send your kids to a school that says "allah is the only way" and "Jihad is the only path to allah"
this is harm
and the kids have no choice in the matter
I used to like vouchers too, would love to have them for my kids, but then I embrace reality, far too many don't