A lot to unpack here....I don't find it argumentative for what it's worth....
Is there a good or service that you can think of that Joe and I could obtain and get exactly the same service or product where I pay $3000 and he pays $600? I understand what you're saying, about the percentages and how you can deem that fair.....that's not my point....my point is, Joe's kid and my kid get exactly the same thing in return....only Joe has to pay $600 for it, and I have to pay $3000. The fact of the matter is, if Joe and I walked into say a grocery store, and we each walked up to the counter with a loaf of bread and the clerk said "Joe, that'll be $1.50" then looked at me and said "Casual, you make more money than Joe, so that'll be $10" I think everyone sees the problem here right?!
Your example can be applied to anything real world. If "Joe" and I each buy the same $30,000 car......and the terms and payments are the same but I make more than him - obviously the payment is going to be higher percentage of his income. The fact of the matter is, Joe chose to buy the same car as me (chose to live in the school district). If he wants to stretch his dollar, maybe he should buy a $20,000 car instead (choose to buy in a different district)? Based on your example and logic, you think Joe and I should both buy the same car, and I should just pay more for it because I make more....that shouldn't sit well with anyone...
In order to get premium things in life, you have to pay for them. You have to make a choice.....it's sort of like the real estate market. You have $200,000 budget for buying a home.....do you want to spend the $200k on the biggest mansion in an awful neighborhood or school district? Or do you want to buy the smallest home in the best neighborhood or school district for the same $200,000? It works the same....if Joe wants to be in a situation where he gets to keep 99% of his income much like myself, then he should choose a school district with cheaper school taxes.....because like everything in life, you get what you pay for!
The problem with this is that the person that no longer has to pay taxes in retirement still gets a vote/say on what the taxes are! That's the issue! Someone not paying income tax should have ZERO say on passing a levy which causes a hardship on everyone that IS still paying taxes...they get the benefit of having new facilities/schools but contribute nothing toward that benefit.