Deron Williams to the Nets

In a surprise move the nets acquired all star PG Deron Williams from the Jazz today for Derrick Favors, Devin Harris, and draft picks. I don't really understand this move by the Jazz who are in the playoff hunt and basically just traded their  best player and only draw for the team. Good luck Deron in NJ as your team will most likely finish with a top 5 worst record this year.