Immune from what, I guess I'd ask. I've seen some LBS's that if not in a full blown MLC after BD, came darned close. I see some that STILL look like they are having their own MLC. JMO, though. I don't think anyone is immune, but we may or may not be prone to whatever sends people into mlc/mlt (and I'll have my BLT with mustard on wheat, please. Extra L.). Some people handle stress better than others. Some are more or less emotional than others. Some have anxiety they cannot handle well. Some see the glass as full even when it is empty. Some have anger issues. Whatever our personality makeup, there is also the physiological side of our makeup. Each person's package helps to determine what they will do with the situation they face. It seems to me that there is no immunity to that, but there is the choice to help yourself (whether with friends, therapy, exercise, etc) if you can do so.
I have no concept of what it would be like to abandon my family. I can't imagine walking away without trying. If some kind of whatever was set off in my body that would allow me to do such a thing, how could I stop it if it just happened and I didn't know it happened?
You say you were a workaholic. Were you always a workaholic, or did you become one because your wife was in stealth emotional cutoff and your were coping as best you could because you could feel on some level something was off, but you didn't know what? I know I knew something was off with my H, but he kept denying it. I also know I started behaving differently because I didn't understand what was going on. I felt like something was off, but he kept insisting he was fine (lying/gaslighting). Was I having an MLT because I wasn't behaving like myself? Or was I simply putting forth the best defense I had against a false situation? Is it still an MLT if you were heading for the transition as a matter of course due to the time in your life (children leaving the nest, getting older, wanting to do things that you could not with small children, etc).
No one is bulletproof, imo. Some of us carry frying pans to deflect the bullets, though.