> When oil companies and defense contractors recruit in engineering departments, they typically don't get much flack. Maybe computer scientists have more of a idealist mindset.
Or more options. By the time a petroleum engineer student becomes a grad student they have probably either figured out that they will most likely be working for one of those companies, or they will have left the field for a more agreeable one. If they've got a problem with BP, chances are they have a problem with Exxon as well...
On the other hand, Computer Science students have a wider variety of companies they can work for. Disagreeing with one or two in particular is unlikely to push them into another field.
Or more options. By the time a petroleum engineer student becomes a grad student they have probably either figured out that they will most likely be working for one of those companies, or they will have left the field for a more agreeable one. If they've got a problem with BP, chances are they have a problem with Exxon as well...
On the other hand, Computer Science students have a wider variety of companies they can work for. Disagreeing with one or two in particular is unlikely to push them into another field.