Earlier quoted context omitted.
Tax rates are not the same as effective taxes paid, and US taxes as a percent of GDP are at an all time high. This is besides the fact that gdp is many times higher, growing geometrically. It is an interesting question of what changed in terms of ability to execute, but lack of funding isn't the answer. I suspect it is a combination of scope creep, application to intractable problems, and baumols cost disease at work…
Don't forget vetocracy. Every regulation, whether it's environmental, DEIA or anti-fraud, adds a few steps to each project. With enough regulations and enough steps, things just slow down to a crawl. As governments and legal systems get older, they get into more and more situations where a bad thing happens, and the politicians must show that they've done something to stop a similar thing from happening again. Nobody…
Sure, there are such cases, but a lot of regulation was written in blood, and the price that affected individuals or even our whole species paid was often monumental:
Having cancer literally eat the workers faces is not acceptable (=> radium girls), nor are mistakes like leaded gas or CFCs.
Everytime people advocate for big immediate gains from abolishing regulations, you can be almost certain that they are selling toxic snake oil.
Current US admin seems no exception, especially when comparing related promises with actual results (e.g. Doge).
edit: I'm not saying that pruning back regulations is bad, but it needs to be a careful, deliberate effort and big immediate payoffs are often unrealistic.