WalMart bad?

I heard about this survey reporting that 56% of Americans believe that WalMart is bad for the US earlier today. I really don't understand why people believe this to be true. WalMart has low prices because they put forth effort to lower those prices. If 56% of these people feel WalMart is bad...then why do they go there. If you think WalMart is immoral...then spend your cash elsewhere. The great thing about capitalism is that the people choose where to spend their money...it's like voting, except with cash.