http://news.yahoo.com/video/us-15749625/the-no-grinding-movement-calls-to-end-provocative-dancing-26293206.html
Lame arguments aside, they were taking things completely out of context. Seth Rogen and Katherine Heigl weren't even grinding in that clip from Knocked Up. I haven't seen the movie in a while but I am assuming they didn't actually grind, or else they would have shown a clip of that instead. Jenna Marbles was talking about random guys she doesn't know/like, she's not against grinding in general. The random "panel" of college girls were complaining about creepers but they didn't seem to have a problem with grinding in general either; one even says something like "they should do another type of dance before they just start grinding..."
Interesting that they reference Footloose since the remake is coming out soon.
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-Merc