In my time with wal mart i found them to be the most ethical company i have ever worked for!
As a matter of fact they stressed it!

We couldnt even accept gifts from aircraft companys trying to sell them airplanes. Not even a umbrella! A large aircraft manufacter tried to give the aviation dept umbrellas as a gift ...nope nobody got one cause it might taken the wrong way and it was against policy.

Oh and i guess i also have a liking to wal mart cause i have made a pretty good return from stock. but thats not the only reason.