Based off of the RC Series concept, the point of the Clone Wars was to make everyone believe that a war was going on. From here, the war would convince people that they needed a capable leader, not one like Valorum, who was a major failure, so thus keep Palpatine in office. Secondly, the army was losing casualties left and right; Palpatine, when making the purchases with Rothana Heavy Engineering, and with the Kaminoan cloners for more clones, justified this at the Battle of Coruscant, where this major buildup of supplies Bessany Wennen was tracking was shown to be a "back-up plan". With the mass number of troops, he could both eradicate the Jedi and have reserve troops to win out the war and remain in favor with the people. He justified Order 66 by appearing in front of the Senate, bearing the scars, and claiming the Jedi as traitors to the Republic. So to conclude, it was to gain favor with the people, justify the supply build-up for the Imperial Military, and eradicate the Jedi. (And have the ability to form the Empire...)