I think your grasp of supply side economics is well off the mark.

Nope its dead on.

Here's a test of your philosophy. You say that companies aren't investing because of fears of socialism/ marxism. If so, then these reasons should be mentioned in the companies' annual or quarterly reports. Give me an example of a company, preferably of a Fortune 500 company, that has expressed those fears to its investors.

Conservatism is a corrupt philosophy.