Don't sweat it
More than a few of the anti-war crowd are freaking out right now, and attacking with whatever is left in their quiver, whether it actually makes sense or not. The idea that right-wing humor is somehow meaner or nastier than left-wing humor doesn't stand up to even the most cursory examination.
For a display of the sensitive and considerate humor of the Left, check this out.
http://www.smirkingchimp.com/photo_query.php?id=22
Plenty more sophisticated, high-class, sensitive humor like this here.