It's difficult to fight tax evasion but rather important unless you want to give up on a system of taxation altogether, which has issues.
When you look at an entity with a large income and very little tax paid you know it's one or both of tax evasion and tax avoidance. Apple. Evasion or avoidance? Which is a fancy way of asking "Is what they're doing actually legal? I can't do that, why can they?" Trump doesn't pay tax because he inherited a billion dollars and thinks he's smart. I know a lot of people who really are /very/ smart, who didn't inherit a billion dollars who pay their tax. They can't decide not to like Trump did.
Rule of law. Equality before the law. Sure. Precisely. So what should the law be? What should the tax system be designed to achieve? What are the consequences of each particular trade-off you consider? Is there some new and better way worth considering or is it just hype to disaster?
And now we're at the starting point of a sensible discussion about tax policy.
I don't pay income tax with my offshore family trust structure but it's legal and I pay sales tax when I spend - those are the only facts that matter the rest is unseemly.
My company doesn't pay tax but it's legal and I pay my employees and /they/ pay income tax - those are the only facts that matter and the rest is just snark.
Leave it out. Leave it right out. All the way out. Then and only then can it be discussed what constitutes good tax policy and what is trying to be achieved with that policy.
Billionaires whining about paying a legal tax that once paid leaves them with more money than they can possibly spend in their lifetimes and those of their children makes me want to spit on my hands, hoist the black flag and begin... - and /I/ tend toward libertarian.