[yummyfajitas]

Well, the poor also make a disproportionate amount of bad choices. For instance, the vast majority of the poor choose not to have a job.

http://www.bls.gov/cps/cpswp2008.pdf

People below the poverty line also choose to risk unwanted pregnancies at a much higher rates than richer people. (The unwanted pregnancy rate for poor people is 88/1000, vs 29/1000 for people above double the poverty line.

http://www.guttmacher.org/pubs/journals/3002498.html#15

So it's not just the case that bad choices have a disproportionate effect on the poor. The poor also make bad choices at a rate much higher than the non-poor.