The job of a politician boils down to one simple task, which to reduce the tax rate; an alternative would be to reimburse taxpayers unspent revenue & this includes actively looking for ways to save on costs, cut spending, etc.
People are always looking to save money, and in a free market, people can get things better, faster, and cheaper than they could without a free market. This is because a free market means competition is possible; this is the basic essence of a free market (there are other aspects to a free market, such as not being forced by the government to purchase a good or service).
When an engineer is designing a consumer product, the essence of their goal is to do more with less (e.g. a car that has certain features, performance, mileage per gallon of fuel, safety, etc. that costs the same or less than the competitor's car).
In a similar sense, this is what political candidates running for office actually ought to be doing with regard to tax rates, and we - as voters - can demand and expect politicians to compete for our votes by lowering the tax rate.
One might wonder, why don't we seem to be doing this? I think the answer is that they simply manage to slip by this without people noticing, partially because political parties monopolize and dominate the political scene, partially because the media very heavily controls the political "focus" - by which I mainly mean that they pick the issues and candidates to focus on or to ignore, and have huge sway on voters this way, and partly by keeping the focus on this farce of a narrative about making the super rich pay their fair share (they have way too much control over politicians - so much that such a thing isn't going to happen).
The only thing that really matters to voters who aren't rich and have to pay a big chunk of what they earned and what they have to pay for goods & services is how much of their own money they have to give up to pay taxes, not what some nameless, faceless super rich person who's supposedly not paying their "fair share" has to give up. This is a red herring to try to keep people from looking at what they have to pay in taxes out of their own pockets (or withheld, etc.).
Political candidates running for public office can and will compete with each other to reduce the tax rate; the catch is simply that the voters have to make this demand known to them.