There Will be blood reaction

I found the film “There Will be Blood” a very tricky film to understand I thought that the development of Daniel Plainview was a very weird thing to understand and his character made viewing the movie awkward at points, because he would become irrational and crazy all at once and it didn’t make sense why he would act like that.  He used to be a wise and cunning businessman and he slowly started to become a psychopath.  Daniels downward spiral happened when Eli had him show up to the sermon and embarrass himself in front of the whole town by having to scream that he was a sinner.  This led to his erratic personality because he had to face what he had down to his “son” and he couldn’t escape that fact that he abandoned him.  In this movie things always found a way to full circle and by that I mean that if someone did something wrong to someone it would end up happening to them.   For example Daniel beat up Eli in the oil/mud pit and when Daniel went into the church Eli slapped Daniel around in front of the whole town and he made Daniel scream at the top of his lungs at how he made mistakes.  In the end of the movie Daniel made Eli scream at the top of his lungs that he was a false prophet and this was Daniels revenge for what Eli did to him at the church.  What I don’t understand about this movie was why Daniel killed Eli, the whole speech that Daniel gave to Eli about drinking his milkshake and how he started hurling bowling balls and bowling pins at Eli didn’t really make sense to me because it came out of nowhere because both characters in the end broke down and Daniel ended up going crazy and killing him.