“Still, I think the cops shooting up the two other pickup trucks has something to do with it.”
Yes, but more than that, it is the powerless cheering for a champion taking on the powerful. Ordinary citizens have been pushed around, bullied, extorted, abused, and sometimes outright murdered by police for years, with little to no recourse. So, even though most people don’t support Dorner killing innocent people (I hope), there is still going to be elation that somebody, anybody, is striking fear into those who have held themselves to be unaccountable.
I concur.