Why did Kylo Ren join the Dark Side? What’s with the Vader worshiping?

As it was revealed in Star Wars: The Force Awakens, Kylo Ren is actually Ben Solo, the son of Han and Leia, who was sent to train at the Jedi Academy with Luke Skywalker. How was he seduced by the Dark Side? Why did he turn against his master and killed the other padawans?

For example, as the prequels showed, Anakin was convinced by Palpatine to join the Dark Side because only in this way his wife could have been saved (yeah, a pretty lame excuse, given the fact that she was fine and dandy). What reasons did Ben had to become Kylo Ren? What did Snoke use in order to manipulate him?

We can also ask why Kylo Ren worships Vader – though the answer will be found once the Blu-ray is released, in one of the deleted scenes. But another question arises – where did he get the helmet of Vader? Is it yet again another convenient explanation such as the one rumored for the lightsaber? Will we find an answer in the sequels? Probably not.