The bottom line is they think that they HAVE thought about it and that they have the answer.
I have browsed through that creation magazine and the things that they trot out as facts are not facts. One thing that stuck out was that they claim that 'one species has never changed into another species via genetic mutation'. To refute this just takes an understanding of what constitutes a 'species', this being, simplistically, groups of organisms whose genetic codes are so similar that if they mated they would produce offspring. If a part of that species is geographically split from the main group then the natural genetic mutations that occur (both random and selected) in the offspring, given enough time, will result in the genetic codes being so different from the original group that if they met one and tried to mate then no offspring would be produced.
That is basic biology and if they can't get that right - and incidentally this has nothing to do with how the original species got there in the first place - then there is no hope of teaching them the beauty and complexity of evolution, and frankly they don't care anyway.