Some creationists do eventually modify their ideas based on where the evidence leads:

Glenn Morton Statement

But it tends to take quite a while, and they need to get quite a good understanding of real science and real evidence before they change their ideas.

I interacted with Glenn in religious discussions quite a bit on various newsgroups and forums many years ago, and then later slightly from a professional viewpoint (I'm in seismic surveying too) when he was based for a while in the UK and got the impression of a very honest and open individual who wrestled with his conscience for years before finally breaking with his original indoctrination. I think he was quite bewildered when his creationist (soon to be former) colleagues reacted in such a vicious and personal way to his last paper.