The Shed

It had plenty of scenes that simply didn't make sense and pretty obvious what type of things were about to happen all throughout the movie. However there was a bit of a plot twist in the end.

The two things that seemed unbearably nonsensical to me, is, (one) if you have a vampire living in your wooden shed on a farm, far away from people, why in heavens would you not set it ablaze during one of the many sunny days available?

Secondly, even though the vampire wronged the main character, the vampire seems to have a personal vendetta out for him for absolutely no reason whatsoever.

There's no backstory, so you really don't know what's the deal with the vampire population. Is it just the one at the beginning, what are the rules, etc