Bingo!!
We’ve brought up the elephant that I did not want to be the one to bring up
I think all would agree with Mariana and Winnie
So it comes out that there is always a line,past which smacking is justified.
To paraphrase Winston Churchill
We both agree, we’re just haggling over price.
So now the question is what’s worse
A child playing with matches or a child being מחלל שבת?