May have been true in the 1960's, but the plastic internal coating on todays cans lasts MUCH longer than those old cans.
True that any bulging can must be destroyed in fire. No-one has seen one in recent memory around here, I just took a poll.
Things have improved since the 60's.
/johnny
Actually, we just tossed a can of fruit cocktail with bulging ends. First one we have seen in forever.