I don't know... Little hard for me to pick... Nah, I lied. Hollywood Whore. That was the very first music video I saw of theirs, and I fell in love with the band, Jacoby, and that video all in that very instant. Though it's verryy close to To Be Loved. I also love Scars, and Getting Away With Murder, She Loves Me Not, I Almost Told You That I Loved You... Damn it. Most all of them are my favorites.
Now as far as the why behind the Scars video, is because I can really relate to the song. Mostly the line; "My scars remind me that the past is real." Because I have visible scars on my body caused by myself, and it sucks to be reminded of that every day... I can relate to the girl in the video. I've been like her more than once before. I can also relate to Jacoby in the video because I feel like I reach out to people, try to help, but they never understand.
Hope that was what you were looking for. xD Peace~