Swamp2, where exactly in Irvine did this happen. I live in Irvine and work down the street from you (in the office towers by the Marriot). In fact I think i've seen you around the block (then again M3's are as common as Civic's in the area
especially space gray & alpine white ones). This was not random vandalism unless you were close to the Carl's Jr which gets late traffic.
Someone took the effort to inflict maximum damage. If you don't think it could have been someone you know I'd say you inadvertently pissed someone off in traffic and they followed you.