Whether Judas did it on his own or on Jesus's asking him to do it takes away nothing from the sacrifice of Jesus for the salvation of mankind. The existing gospels provide ample proof that Judas did it on his own and was then remorseful for it. Moreover, Jesus did not need to take the help of any deception. In these end times, such issues will come up more frequently, but will only serve to attract more people to study God's word - The Bible to know the truth for themselves.