My guess, these kids don't get punished. Kids raised with discipline do not behave that way unless there is some terrible mental defect. Regardless, the babysitter is better off without video evidence against her, child endangerment is pretty serious.

Not to mention a video would show how much OP sucks at babysitting. I know kids can be a handful but for that many serious things to go wrong there is no way they were being supervised.

Run a muck? Surely you meant "run amok". I don't remember reading anything about them running into muck. But then again, I'm old and my eyes fail me.

I have watche'd three kids ranging from 4-12, who's parents were seperating and the children had a lot of emotional struggles because of it. They were always fighting and one was always running left while the others ran right. Did they ever get a hold of a knife or lighter fluid or matches? Hell no. Dont use the "children are sneaky" excuse, that's a cop out. OP should have been watching them better. I have a sneaking suspicion that OP was on their smartphone or watching TV. How long does it take an adult to find the damn end of a ducktape roll? It would take a child far longer, which means these kids were left to their own devices for a while.

Duct tape? My duct tape is sitting up on a shelf above the washer. Not everyone even adults have trouble finding duct tape. Which I don't know how that is comparable. It isn't an excuse... We make mistakes and it happens. I doubt the parents warn OP how wild the children can get.

I have a set of twin toddlers and a school age child....it's really not THAT hard to watch them. And I say that as a mother, who handles all the regular housekeeping and cooking, as well. A BABYSITTER, who is hired to WATCH the kids, really shouldn't have any trouble keeping tabs on where two kids are and what they're doing. This is pure negligence, and if a sitter I hired ever let things get THAT out of control at my house, I would be looking for a way to press criminal charges.

I have four kids. Are they quick and sneaky, yes. Has anything even half this horrifying ever happened? NO! Not even when all four are working as a team against me! Why? I pay attention, at least in regular intervals. It probably also helps that I'm not above corporal punishment for terrorists activities.

I didn't say finding duct tape.. I said finding the end of the duct tape... you know, to peel it?

I have 3 children all less than 2 years apart, it has been very difficult at times but never as serious as what OP is dealing with. Yes, they are fast but I'm always a step or two behind as it is my job to be as a parent. Sharp objects should always be placed way out of reach (out of sight out of mind) as well as matches. While accidents happen on my watch, it definitely would not be due to a knife or falling off the roof. It takes it to a whole new level with all those things involved in a single sitting...like neglect on the adults part.

Probably each step happened as the sitter was trying desperately to solve the problems from the previous one. Kid scares his sister, sister gets upset comes to sitter, while sitter and sister talk, demon child makes knifegun, sitter begins crisis negotiation, demon child ignores and runs around destroying things, sitter in frantic damage control, demon child gets to barbecue which parents must have recently used and left the fluid nearby, meanwhile sister is in fear for her life from demon child and climbs up on the roof, which might be a split level home or a garage roof. Plenty of my friends houses growing up had roofs that you could get on top of with an object to climb on, maybe 8 feet up. The how is simple. The WHY isn't.

Hopefully, OP will have the good sense NOT to have children. Although, if she can't keep a knife out of a child's hands, I doubt she understands birth control, either...