Why would you assume a looney tunes chain of events when parents killing their kids is like the most normal fucking thing in history? Sorry to bum you out, but parents murder their kids every single day, its a hell of a lot more common than some rube goldberg chain of bullshit like you are describing.

https://edition.cnn.com/2017/07/07/health/filicide-parents-killing-kids-stats-trnd