Earlier quoted context omitted.
This is a pretty stupid assumption to make. All the of the 'weaponized brain' bullshit is coming from breathless web journalism types -- DARPA's research is into offsetting TBI, which is a real problem for many, many veterans. If you need proof that not everything DARPA does is going to immediately commit mass murder, consider the internet you used to post your teenaged witticism.
This 'weaponized brain' bullshit arises out of a very legitimate fear of the US military, the right-wing nutcases that pull its strings, and its extensive history of unethical human experimentation. If DARPA is seriously interested in reducing TBI then perhaps they should consider conducting fewer fraudulent wars.
You may want to look into the history of the military in the U.S., both right and left share in it's excesses.