I don't think Luke embraced the light at the end of Jedi. I mean shit, he got baited into fighting Vader just like The Emperor wanted, he just had the sense to realise he was being played. He helped Vader realise there was light inside of himself, and importantly gave Vader something to protect. I think they really leave Luke hanging in a lot of ways - a big one is how clear they make it that before The Emperor tried to kill him Luke had never seen the power of the dark side before, and they definitely show him as being a kind of angry guy.
Also you don't have to be a big bad space wizard like The Emperor was to be an agent of evil. Maybe if he'd completed his training he would have been able to stop Kylo Ren turning to the dark side - training from an inexperience Jedi might be more harm to the universe than good, if he's really just lining up some powerful young dudes to get converted.
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