I agree there should be a military and a defense industry which is _different_ from our current system. I believe anyone working for the _current_ system is likely to be causing harm greater than the good they also cause.
Malevolent implies intent. I'm sure that there are non evil people who are working for BAE. I'm also sure that the vast majority of them have facilitated far more innocent death than worthy defense of life.
> casualties suffered by our armed forces in combat would be far higher
I have not supported any of the military action my nation has taken in my lifetime and any casualties are primarily a result of the greed (for power, votes, or wealth) of those in power. The lack of equipment has acutely caused casualties, but the existence of the military industrial complex has caused the wars in which they take place.
I'm not saying I have the great solution to end all war and create world peace. But I can't see a reason other than naivety, apathy, or propaganda that someone could work for BAE and think they are doing good in the world.