Neil is quite known to be a prankster (As stated in his biography) but that means he humors...Even during operations. Neil knows what's wrong and what's right...Even capable of breaking a few rules in a second moment. He is willing to throw himself out there, even if that means he must risk his own life. His trust in humans is...Unchecked (He hasn't come in contact with one...Well especially those that are from H.R.L) But he could see David is different from them.