Stark Industries is not an "evil" company per se, although an argument could be made about being worldwide arms dealers and thus inherently evil (for all the tree huggers), but I would be happy to wear this shirt in public, especially since no one else would get it.
Since I can't help myself, let me say that Stark Industries is a RL company that manufactures air compressors in Houston, Texas. Unlike most of the other real life companies with names from fantasy corporations, Stark Industries of Houston Tx actually has a cool looking logo. Check it out here:
http://www.starkindustries.com/ Looks kind of like one of those 45 record inserts. By the way, Tony Stark's middle name is Edward.