I have never called a company to tell them how to run their business, and I never will.
I make purchasing decisions based on a variety of factors, the primary ones being price, quality, and the manufacturing process. What Vick does has no impact on that, it's a matter for him, the courts and Nike to resolve.
Child Labour is part of the manufacturing process, and has a direct impact on the product I receive, and I don't support companies who do that, but I also don't ring them to tell them how to run their business, I just don't buy.
Would this stop me buying Nike stuff? No, but I rarely buy it anyway, only at factory outlets. It's rarely the best price/quality combination, and I don't buy stuff for the brand name.