Question: why do samcro want juice dead?
Answer: The reason that Jax wants to kill Juice is because Juice betrayed him (again). Last year, in the penultimate episode of the season, Bobby recommended that Juice take some Oxycontin to deal with his pain. Juice did so, but he took way too much oxy, and nearly died of an overdose. ... And that's why Jax wants to kill Juice.