Household help is great if:
1. you are around to supervise
2. you can communicate
If you’re not around to watch them, they WILL treif up your house, and they WILL steal if they can get away with it.
And this leads to another good point- babysitters. Many people have babysitters in their home all day. These are goyishe babysitters and nobody’s checking up on them. you can tell them all you want not to use the oven, but why should they listen if the chance of being caught is zero?