I think that's mostly the issue- they're 'wild' animals so they rely on their instincts (in the case of BPs, mostly to hide)- they just don't understand that we're going to protect them, so when we handle them, they feel exposed.
But there's so much variation among snakes, & also for our own ability to transmit calmness. My all-time winner for the most mellow snake to hang out with (& watch a movie for hours) was my late boa (BCI)- who knows, maybe she was even following the plot? hahaha!![]()