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It's ok to laugh if you find such things funny. Don't force it if it's not your brand of humor. Let common sense and your own morality decide what is appropriate and what is not. I have liberal values through and through, but I think part of the reason many Americans do not share these values might be because of PC over-reactions. And PETA, and vegans, and other morons like them. Sometimes us libs and dems just go "full-retard", unfortunately.