The adults are pretty useless in this movie
I don't know if that was intentional but I noticed that the adults in Hocus Pocus are pretty ineffectual and inattentive.
Take for example Max and Dani's parents, they don't at all believe them when they say that the Sanderson sisters are pursuing them. So what exactly would Max suppose to say to them after Dani gets kidnapped? I don't think that Mr. and Mrs. Dennison even paid any mind that those two bullies stole his white sneakers.
And obviously, Max, Dani, and Allison can't trust the police if that one encounter with what turns out to be a fake motorcycle cop means anything. Plus, where are Allison's parents in all of this? They don't seem to notice or mind that she snuck out of their fancy Halloween party and she's been out all night battling the supernatural.