I like Seven Cubed's idea. I was selling an item, seeds for a poisonous plant that people wanted to grow because lots of people just like to grow poisonous plants for fun and others like to use them in witchcraft, not to do any physical harm. It turned out that very rarely people were buying the seeds and then using them to try to poison other people, themselves, or animals. First I limited the packs per purchase, but I still got the occasional email that made me suspect that a customer was intending to do something evil with my seeds. So even though I was the only company selling these seeds, I ranked number one for these seeds, they sold well and helped people find my site, I quit selling them because I didn't feel good about it anymore. I know people could go to the grocery store and by rat poison if they wanted to do similar harm, so it wasn't like my seeds were causing this behavior, but I felt like my entire endeavor was being schmutzed up by the bad karma of what a very few people wanted to do with these seeds.
We are in business for ourselves not because we just want a job but because we want something more--our own business where we are the boss. That means we get to make decisions that for others might be irrational because they are based on something other than the bottom line. As far as I am concerned, being able to act on one's own ethics or ideas or a hunch or whatever is part of the beauty of a small business.
If it makes you feel better to get rid of those shoes, get rid of them by giving them to a charity.