It's probably a tiny minority among the contributors who are creating this garbage. I am sure in years to come some of the sick artists who find these designs amusing will one day be sharing a cell alongside the scum they have slapped on their T-shirts and baby rompers.
The obvious and agreed upon bad guys aside, what's amusing is what is considered offensive can depend on your political slant. Some lefties will throw a fit if they see a George Bush T-shirt. Some right wingers will see red if they spot a Che Guevara one.