Yeah sometimes we let ourselves think that they know us and know exactly what is going on, however I have come to the conclusion its a lot simpler than that. You handle them as a baby, they get used to your scent, maybe your voice or the tone of it so since we have been doing this since they were little they know we aren't a threat. so they have no reason to be in attack mode or cautious. I have 10 bp's now and ive come to the simple conclusion that some are okay to be handled because they aren't as skittish or weary of the big heat signature coming at them. then again I have some that no matter how many times I enter the enclosure they are fully on the defensive. time of year, temps, storms incoming seems to make a big difference in temperament also.
Great pets though imo. I just started collecting about 4 months ago and I have 10 snakes so yeah ... lol im a sucker