You can make whatever assumptions about me that you like, but they are are unlikely to be correct. As it happens, we live in a very ordinary house that came with a very average price tag, because neither DH nor I wanted a big mortgage. Indeed, this is one of the reasons why we could have comfortably afforded private in the first place, precisely because we hadn't overstretched ourselves on the mortgage.
My dc went to an excellent state primary school followed by a very average state comprehensive at secondary. Her secondary school certainly wasn't the type of school that people would buy in the catchment for, but to be honest, none of the schools in our town are. We did look at private options as well, but concluded that they weren't worth the investment for our dd, who was the type that would thrive and excel anywhere.
I don't judge other parents for using private schools. I think it's a valid choice and I might have considered it more if my dd had been lacking in confidence or less self motivated etc. However, I do see them as non-essential luxuries, and as such, it makes sense to tax them as such. I have quite a few friends with dc in private schools who agree with me, so it isn't about spite or jealousy, and I certainly have no ill will towards privately educated children. It's just a different view of what society should prioritise.
My issue is absolutely not with parents who choose to privately educate. If people have the money and they think it's a good investment, then fair enough. My issue is with the people who believe so strongly in their own sense of entitlement that they resent having to pay a bit of extra tax on the school fees. Most will be able to comfortably afford it. Those that can't will just have to accept that private school will be out of their reach, as it already is for the vast majority of families in this country anyway. I really can't see that as a tragedy.