The reason that the theory of evolution keeps changing is that it is trying to cope with all the new facts as they emerge.
Yes, that's how science works. We revise our theories in the light of new data. If we didn't, it would be called "religion".
But if evolution were falsified the results to the establishment would be unthinkable.
Not so. The scientist who falsified the theory of evolution would be guaranteed the Nobel Prize, because that would be the discovery of the century.
So they keep repairing their littel ideological ship till a better one comes along that doesn't have intelligent design written on it.
I'm sorry you see something shady about the idea that our theories should explain data. For my part I'd rather be mostly right, and getting right-er, than totally and unchangingly wrong.