For instance, I'm an overweight gentleman who has vanishingly little ability to delay gratification when it comes to food. Because of those traits, I rarely choose to shop at the grocery store, and instead opt for fast food on the way home. However, when I do shop at the grocery store, I kick serious ass. I find the sales, I buy the healthy stuff, and I'm super nice to the person who watches the self checkout stations. Therefore, the same trait that make me less likely to shop at the grocery store does not at all negatively affect my suitability for it.