I've always thought that simply just to choose what to believe is to give up on rationality. One shouldn't pick and choose what one's going to accept as reality, especially on something like this that can potentially affect others. (Indirectly of course, an example being someone voting against evolution in schools) At this point, evolution has been challenged countless times, and it hasn't ever lost. Creationism, on the other hand, has a lot of explaining to do. To quote someone, I can't recall who at the moment, life as a whole shows more examples of unintelligent design (i.e. any vestigial organ) than that of an intelligent creator. It's to demonstrate willful ignorance to choose to disbelieve something despite having every reason to believe.