I have two kids and neither of them have ever had serious tantrums. I don't know why, they just don't - except the odd stump the floor with feet when they can't have a 4th biscuit or something stupid. Then I distract, but don't give in.
I find it really hard not to judge other people and children who have massive fits for no obvious reasons. I try not to judge them, but deep down I do. Help me understand tantrums, why people think it's fine and acceptable to ignore.