I think most people who disagree with you understand that not everyone who is high-earning comes from a privileged background.
In a world where people can become millionaires from being an influencer and posting videos of their lives (or their feet/ or their private) and most people with a degree struggle to find work in their field, education is barely relevant.
I am high-earning and the only diploma I have is my high-school diploma and I come from the least privileged side of society (food banks, social services involved, lots of sexual and physical abuse, the whole bingo card. I am a woman, I am black and I am gay and born poor to a teenage mother. I work since I am 17 though, I was also always saving any birthday or Xmas money I had and even developed a small business at 13 (that was going quite well). I have seen my family live off of benefits, and my mom have more kids than she could afford and I have seen her be accustomed to pick not losing benefits over earning more/working more and I have seen two of my siblings follow that path (working the system rather than working).
Plenty of low-earning folks are hard-working, the great majority even, but it doesn’t take away the fact that our current society doesn’t reward work. It currently squeezes you if you work and pass it down to not only people who need it or can’t afford to work but also to all those who chose not work while the great majority of workers (which would be your low-income or average-income earners are hanged to dry) struggling to pay bills and navigating a collapsed system where rent are astronomical, health is a luxury and education is supbar (and not even a guarantee of a good job anymore.)
You seem to the see world from solely your own prism and seem to believe in only one reality. The reality is that many high-earning folks aren’t privileged, many are self-made with humble background and likely from families who worked hard and needed benefits at some point, so understand the system and didn’t initially begrudge paying taxes when they started earning well. Most do now because we simply aren’t getting what we pay for.
Our system need a revamp and everyone who think the revamp should be taxing even more the rich (as if they can’t afford to move away) don’t really grasp why that’s not the smartest idea.
Currently people on benefits believe that high-earner are both the problem and should also be the solution. When really no system should rely on a small chunk of the population to sustain it, and no one who can work should be sustained by the system either (more than temporarily).