but there is just no right or wrong answer to every question... sometimes it's just about opinion.
sometimes these questions are trivial (which color of tie should I wear with this shirt) and sometimes they are literally life and death questions (should death penalty be legal)... and there will always be people with opposing opinions on them. "agreeing to disagree" is literally the best possible thing they can do to live in the same society.
it could and did happen. I remember reading about 6 year old kid getting lost at the airport gate (i think it was in germany) only to be discovered when they finally looked for their parents in italy. just went away while parents were preoccupied with something else and looked like someone else's kid while boarding the plane. as a parent travelling with small kid I can totally see that happening anywhere - kids can just walk anywhere with no questions asked as long as they are next to an adult who looks like they could be their parent.