It’s also possible the kids and/or parents took the danger there into account, compared it against the perceived danger of staying home, and decided it was either a wash or an improvement. Part of the reason it’s so easy to recruit suicide bombers is that there’s a rampant (incorrect) perception that you’re going to get killed, jailed, maimed, or tortured anyway, just by living a normal daily life. But if you truly believe avoiding trouble gains you no safety whatsoever, could that change your decisions?
Risk assessments are often very wrong, based on social factors, politics, and stories people like to tell themselves. People still buy guns for self-defense in the US all the time, endangering their families due to skewed risk perception. Same with rallies, I suppose.