So many illogicalities, so much stupidity, not well made

This is not a good horror movie! I am not trolling, it's just that there are so many things that don't make any sense and here it's too much of it even for a horror genre. We all know horrors are not most logical movies, but here's what we have here:
1. Would you invite complete and absolute stranger to stay with you for a Weekend in your very isolated cabin in the middle of nowhere?
2. Would you stay there if you are warned there is a dangerous serial killer wandering around?
3. If you find strange man, a complete stranger, who is obviously wounded with knife would you call the police like immediately or just invite him also to your isolated little cabin to stay with you?
4. Strange wounded man recovers, would you believe every of his words and still not call the police? Because, what a hell, he must be telling truth and if he is not insisting on police why should you?
5. Would you go fishing with strange man you met for the first time in life and not be bothered that he seems very guilty of something serious?
6. And yes, to go fishing, would you leave your rather stupid sister and your girlfriend alone in cabin with other strange man you met first time in life?

So you see there are only few stupidities from this movie and there are more.
Yes, horror demands suspension of belief but please, don't underestimate viewer intelligence.