It is not that new. It was done when I was young, a good 20-25 years ago at age.
My mum never allowed us to do it, as she considered it begging. I followed this view too, as to be honest I never had any reason not to, as I had no child.
But now I have a child and DH and I have discussed this. I have changed my mind.
We, for example, have money, enough money to live on anyway, so if DD goes trick or treating with her daddy, it is for fun, and she will be just as happy with a trick than a treat, as this is what she will be told is fun about it.
The 'treats' given are so minimal, how could it be begging? Begging for what? For their sweets? Many of them have spent hours on their costumes, and parents have paid money for the outfits. If they were begging, they could just not bother with the costumes and use that money for treats!
I think part of my mother's issues with it, was that we were poor, so she considered anything given to us as a handout, so I think that is why she thought it was begging.
At Halloween - we buy sweets/snacks and we now look forward to children knocking on our door for treats/tricks. This year, we are going to do some tricks too! They are never rude, always with parents, and if they are on the blag with no costume, they get sent on their way.
Its just a bit of fun, ffs.