Jeremy plot was dumb
Tries to escape police by climbing up to a treehouse? Wut? Where's he supposed to escape to next other than being stuck up in a tree? Not only was his escape plan dumb, but he also fell from the tree and broke his own damn neck (so an indirect suicide).
When people are asking why did he kill his parents?
https://youtu.be/Co75ug5wf7g
Some people are just psychopaths. Look what he tried to do with Astrid even after death and the haunting he continued to do before meeting her.