To quote the Video Blogger host of "Shameful Sequels" in his review to "Garfield 2" (paraphrased): "Bill Murray refuses to do Ghostbusters 3 but he says yes to this shit?"
Apparently it was a case of mistaken identity:
Of course, this does not explain why he did the second one as well (but to be fair: he was the best thing about those films).
If you believe that, then you'd also believe that Chuck Norris can personally make a $100 million movie he's barely in PG-13.
Maybe Ian McShane and Joan Allen can explain Death Race by saying they thought they were going to be working with the Paul Anderson who made Magnolia and Boogie Nights.