Older kids and tantrums
It seems to me like as my children got older I could squelch the tantrums a whole lot faster but getting eye level and talking in a soft voice. They had to be quiet to hear me and it seemed to have a calming effect on them.
I always made the rules well known though. Stay with me, don't ask for a million things and use manners. I was not above giving them a quick reminder before we went into a store.