Is the human race a universal constructor?

The overwhelming majority of theories are rejected because they contain bad explanations, not because they fail experimental tests.

If we can't program it, we can't understand it.

If you reject the infinite, you are stuck with the finite, and the finite is parochial... the best explanation of anything eventually involves universality, and therefore infinity. The reach of explanations cannot be limited by fiat.

I myself believe that there will one day be time travel because when we find that something isn't forbidden by the over-arching laws of physics we usually eventually find a technological way of doing it.

Our best theories are not only truer than common sense, they make more sense than common sense...

Where we have good, testable explanations, they then have to be tested, and we drop the ones that fail the tests.