Why did the emperor in Dune send Paul and his family to Arrakis?
Did he want the family to be murdered? If so, why didn't he just murder them on their own planet?
Why did the emperor in Dune send Paul and his family to Arrakis?
Did he want the family to be murdered? If so, why didn't he just murder them on their own planet?
The 2021 movie doesn't say much, other than "the Emperor is a jealous man", but in the novel (and hopefully the second part, due to be released in 2023) it is hinted that Duke Leto is very popular among the Landsraad (the representatives of all the Great Houses), and has been cultivating quite the fighting force who, individually, are every bit as good as the Emperor's Sardaukar forces. While he lacks the numbers, Duke Leto is seeking to expand his army.
This is something the Emperor is wary of. The Atreides do have a small claim to the throne - I believe Leto is a distant cousin of Emperor Shaddam IV - and the Emperor's power is not absolute. He fears that the Atreides, gaining in popularity, power and influence, could make a play for the throne themselves - though that would probably take a few generations.
As such, he brokers a deal with the Harkonnens - the Atreides sworn enemies who are currently the custodians of the spice harvesting operations on Arrakis. Moving the Atreides in was always only temporary - it gives the Harkonnens the perfect cover for an all-out devastating attack on the Atreides (the Harkonnens' brutal reputation is well known, and everyone would just believe the Harkonnens attacked to get their valuable spice operations back - the book even allows them to declare "kanly", a sort-of limited war), and the chaos would allow the Emperor to send in his Sardaukar in secret to provide help while keeping his hands clean.
Of course, this is to great expense, and cannot happen on the Atreides' home planet of Caladan, because the Emperor cannot be shown to be involved. As mentioned, he does not have complete authority. Physically he could have eliminated the Atreides on Caladan - the few times it features, the planet and its population are relatively primitive. However, the chances are greater that the Atreides would be able to at least get a message out.