At least they are a lot safer these days, I remember in the 70's when all the gate guardians had to be checked for live seats after an aircraft on a gate in the USA was being moved to be refurbished and the seat went off killing the poor sod on brakes..
The UK wasn't much better, remember the 22,000lb Grand Slam on the gate at Scampton that was being removed and was found to be live and full of explosive when they couldn't lift it.