Yeah - the reason the papa of my 1st spawn died? My then 3 year old. He found the net and climbed on the counter and tried to catch him .. but instead tortured him to death :( I was NOT happy and believe me, he knew it. He genuinely felt bad for killing him, and has left my fish alone since then.
And I have to say we can't realistically put up tanks to the ceiling to keep our young'uns away from them. Even then they WILL find a way to get to them. I promise you that lol. No offense, but you obviously don't have willful spirited kids ;)
And to lock up our aquariums where we couldn't enjoy them all the time? Then what's the point of keeping fish? Sometimes accidents happen, nothing you can do to prevent them. You teach your kids to leave certain things alone, just like you wouldn't pick up everything in the house out of reach when you have kids. It's just not at all feasible.