The most important thing to understand about inversion is that it does not in any meaningful sense involve American business “moving overseas.” Consider the case of Walgreen, the giant drugstore chain that, according to multiple reports, is on the verge of making itself legally Swiss. If the plan goes through, nothing about the business will change; your local pharmacy won’t close and reopen in Zurich. It will be a purely paper transaction — but it will deprive the U.S. government of several billion dollars in revenue that you, the taxpayer, will have to make up one way or another.

Does this mean President Obama is wrong to describe companies engaging in inversion as “corporate deserters”? Not really — they’re shirking their civic duty, and it doesn’t matter whether they literally move abroad or not. But apologists for inversion, who tend to claim that high taxes are driving businesses out of America, are indeed talking nonsense. These businesses aren’t moving production or jobs overseas — and they’re still earning their profits right here in the U.S.A. All they’re doing is dodging taxes on those profits.

And Congress could crack down on this tax dodge — it’s already illegal for a company to claim that its legal domicile is someplace where it has little real business, and tightening the criteria for declaring a company non-American could block many of the inversions now taking place. So is there any reason not to stop this gratuitous loss of revenue? No.

Opponents of a crackdown on inversion typically argue that instead of closing loopholes we should reform the whole system by which we tax profits, and maybe stop taxing profits altogether. They also tend to argue that taxing corporate profits hurts investment and job creation. But these are very bad arguments against ending the practice of inversion.

First of all, there are some good reasons to tax profits. In general, U.S. taxes favor unearned income from capital over earned income from wages; the corporate tax helps redress this imbalance. We could, in principle, maintain taxes on unearned income if we offset cuts in corporate taxes with substantially higher tax rates on income from capital gains and dividends — but this would be an imperfect fix, and in any case, given the state of our politics, this just isn’t going to happen.