Most of the list is due to ease of theft and utility. As mentioned, the vans are useful and blend into traffic. No one steals an STi to commit a robbery. They are stolen because the parts are valuable and they are simple to take.
Oh, and use "The Club" but only in conjuction with other anti-theft measures. They are a minor deterrant to a real thief.
Hondas are easy to steal, and they were the last (and Subaru) to install decent anti-theft devices as OE equipment. I have heard that the best way around the immobilizers is to break into the house and simply steal the keys.