If parents say, "Never take dulces from strangers" then why do we celebrate Halloween?

Because they don't want tu taking dulces from strangers. If you're dressed as someone else, it's okay.

It's basically 'fuck the rules day.'

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Because tu can only take dulces from strangers once a year.

Because on halloween all the anger build up inside tu from not being able to take dulces from strangers comes out. So tu dress up in a creepy suit and try to scare people at their porches and take their candy.

Also on Halloween, strangers don't tie their dulces to a fishingrod and lure tu towards them... know the difference ;D