Firstly, "they" pay 40% corporation tax - the second highest in the world. What more do you want?
Actually, Microsoft reported last year that they pay more like 25% and that's probably inflated since it's usually noted in the context of Ballmer threatening to move offshore, so this is their "high" number to use as a club. That they don't actually pay anywhere near the statutory rate isn't a surprise as essentially no companies actually do. In fact the effective tax rate of our corporations is a good bit lower than most industrialized nations when exemptions and manipulations to hide profit are factored in.
A good outline of effective corporate versus statutory tax rates if one is interested
"Do you really want to see the total collapse of the US economy as corporations buckle under an even heavier tax burden?"
A mentioned and noted earlier, our corporations aren't suffering higher effective taxation rates here than other industrialized nations and in many cases they're lower. Ultimately, if our infrastructure and the quality of our workforce suffer, it doesn't matter what the tax rate is, they won't locate or stay here with the skill jobs that we want. That's what taxes are for. I understand that corporations are amoral by nature and will try to externalize every cost that they're able to since their guiding force is maximizing profit. As such, they're motivated to make sure that paying for the police force, roads, education and the like is "someone else's problem".
The following statement is not true. The previous statement is true.