your child starts crying, throwing a tantrum, demanding everyone goes home, is agitated or aggressive
Quelling this behavior is parenting 101. This is never allowed to fly from day one from any of my children. I have 8, and have been a parent for 24 years with the same wife. I think I am qualified when I call bullshit.
So I'm not saying you're wrong (I'm not a parent and I haven't carefully considered how I would do so), but surely you must realize you're an (extreme) outlier and your experience doesn't necessarily apply to most people right? 8 kids over 24 years with the same wife is incredibly unusual, and I can think of several things off the top of my head that would apply to you and that situation that wouldn't apply to me.