-- Danny shows almost every sign of the psychological impact of child abuse: severe anxiety, hypervigilance, academic problems (dropped out of school), problems connecting with others (he says he has no friends), and flashbacks/visions.
-- When Danny shows up with bruises later on in the film, Wendy immediately accuses Jack of hurting him, despite the fact that kids can get hurt in a million different ways on their own.
-- Also, check out Danny's body language in the one scene where Jack tries to hug him:
As far as motive goes, Danny wanting to get revenge on his serial abuser father makes way more sense than the Overlook Hotel just wanting to ruin a random occupant's life for shits and giggles.
We're also shown early on that Danny has superpowers -- specifically, the ability to communicate psychically. My contention is that Danny's powers were far more advanced than he let on, and in fact extended to actual mind control, and that the seclusion of the Overlook Hotel provided him with the perfect opportunity to use these powers to enact his grisly plan, free from the interference of any third party. I'll have more evidence for both of these points later on, but I just wanted to establish them as cornerstone ideas immediately -- the delicious flaky crust covering the homicidal croissant that is this theory.