Well, if you want to get technical, Light used Rem to kill L, so in a roundabout way, he was at fault.
But really, my dislike of Light has nothing to do with L. I hate Light because he's a spoiled, manipulative, and hypocritical serial killer with a god complex. Sure, he's an intriguing character from a sociological point of view, but there's nothing about him I find actually likeable.
i like light but here is my theory: light wanted misa to tell rem to kill L. because misa had the shinigami eyes but she was under servailence by L. so the only person left was rem. so light told misa to tell rem to kil L. misa started saying :please please please: *puppy dog eyes* so in the end it was in a way light cuz he used misa to get to rem.
Light made it so Rem was forced to kill him.
But I don't hate Light. I just hate what he did. No point in hating on the main character of the series, as we gonna be seeing him a lot when watching through Death Note anyway.
He's still my second favourite, next to L of course.
As for Rem... I never had much interest in her but she'd make a kick ass shinigami to have.
And Misa... I don't hate her either. I found her hilarious. Actually, I don't think I hate any of the characters...
Well, Light kind of made it inevetible to kill L. He forced Rem into a situation where either L lives, and Misa, who Rem was greatly devoted to, die or kill L, who Rem barely knew, and let Misa live.
And second, I just dont like Light. He seemed very conceited even without the Death Note.