> Why is it a problem?

People need government services, the government needs money to provide them. If corporations don't pay enough taxes, individuals and small businesses need to be taxed higher. Taxes are a burden on them. We shouldn't do that.

> Why isn't government overspending ever a problem?

It is, like all the time. When is the last time you heard something like a pre-election debate that didn't bring up government overspending?

> Why isn't government overspending ever a problem?

Whataboutism. This has nothing to do with the issue at hand. If the government wasn't "overspending" to whatever measure you interpret that, the issue remains.