It is absolutely essential that we keep our minds open to alternative explanations for the universe in which we live and with which we interact. Just because one explanation is the accepted explanation doesn't mean it is "right" - there may not even be a truly "right" answer to a lot of the deep, probing questions about the universe. If we hew too strongly to a single explanation simply because it is the one that is commonly accepted, then we will inevitably be scoffed at by our ancestors the same way we scoff so readily at those who did not accept Copernicus's teachings.
