Well it's easy as in the enemy pilot AI doesnt really seem to put up much of a fight. As for your second point, if you were in a fight with someone, and someone else who you hated more walked up, would you turn your back on the person you where just fighting with and start ANOTHER fight with out finishing the first one? I could understand if maybe they killed the enemy and THEN go after me, but its poor coding the way it is now.
gee you kill hundred of them and then wonder why they focus on you when ya show up. LOL.