As someone who was once an electrician, I find it very unsurprising.

When someone just shrugs off the occasional 230 and 400 V zap, they're unlikely to wear more than a safety squint and tie when playing with kilovolts...

Sounds like the normalization of deviance.

Kinda like how familiarity with using a table saw eventually costs people their fingers.

Table saws seem like a bell curve. Low familiarity leads to lost fingers(or being impaled by a kicked back board), mild familiarity saved fingers and know how to avoid kickback, too familiar back to lost fingers but you likely won’t impale yourself.

That's more of a U-curve. Tall in the ends, short in the middle.

Yea, my grandfather was an electrician and I have see him create some truly dangerous electrical arrangements around his own house. He almost killed my dad by having him work on a live wire without telling him it was live because that is what a “pro” would do.

In your grandfather's defence, it is what pros do, as the pros rarely follow safety practices.

It's so ingrained that I have to fight back to not start explaining why getting zapped by mains is perfectly safe in the vast majority of cases. That is a piece of information that - while technically correct - completely misses the point that working with any risk whatsoever is pretty stupid when you can remove all risk by just disconnecting the circuit.

Experienced electricians aren't usually dealing with voltages that high.

Well, a residential electrician wouldn't work with kilovolts, no.