Politics is extremely divisive and, even more importantly, is perhaps no longer a major vessel to enact meaningful longterm change. There is of course the issue of one decade's change being overwritten by the next decade's party. But there's something more fundamental. In times past government was able to enact huge changes, because government enacted and enforced policies that directly harmed society. Slavery is the most obvious one. Government worked as an enforcer for slavery and was equally able to end it with little more than a vote and stroke of a pen. But in today's era I think we've started to reach an era of sharply diminishing returns for governmental action because the issues are ones that are less systemic and, in any case, cannot be directly solved by government in any completely clear way.

For instance you mention education. If you poll most people on our state of education in the US the results would have little to nothing to do with reality. And that reality is that we already spend an immense amount on it - more than nearly anywhere in the world. This isn't a proxy for population size, I am referring to cost per student of course. And this also isn't just a proxy for ridiculous university costs. If you look at only education costs outside of university, we are the 5th biggest spender in the world. And similarly this isn't a proxy for private spending with wealthier folks sending their kids to private institutions. If you compare just our public spending on this same group of education, we end up 7th in the world - comparing just our public spending to everywhere else's public + private spending. And as an aside, those costs are all normalized to account for the fact that a dollar goes a lot further in many places than the US - meaning we are indeed comparing apples to apples, by multiplying other nations' nominal spending.

All numbers mentioned here from the OECD data [1]. They list the private/public spending in GDP relative ratios which does silly things like put South Africa and Costa Rica as the world leaders in education, but you can convert those figures into something useful. For instance in the US our GDP relative share of public spending on education outside of university is 3.207. Our GDP relative share of private spending on education outside of university is 0.307. Therefore of all our spending on non-university education, 3.207/(3.207+0.307) = 91.3% is public. You can now take this and apply it to our gross spend on non-university education ($12,424.3 dollars per student) to see that we publicly spend 12423.3 * .913 = $11,342 per student per year on education outside of university - which leads to our public spending being higher than every other nation's, excepting 6, public+private spending

The point of this is that most people think that we just need to spend more money on education and everything would be dandy. No, our problems are more fundamental and require solutions that are in no way obvious. Bill Gates, though I do not particularly agree with his direction, is working towards trying to create these very sort of solutions. And these solutions, should he be correct, are what actually have the possibility of enacting real longterm change.

[1] - https://data.oecd.org/eduresource/education-spending.htm