Because he said that some of the lws of Moses were no longer to be followed. He was right, but the people didn't know this.
People crucified Jesus because they saw him as a threat to their religious and political power.
So people can see and know more about Jesus.
jesus
The Romans did not view Jesus as a political threat. It was the Jewish priests who saw Jesus as a threat. When they presented charges of sedition against Jesus to the Roman governor he did not believe these charges and thought that he was innocent. He tried to save Jesus, but was forced to sentence him to death by the crowd.
The scribes and Pharisees were the "spiritual" leaders of the day. But they were far from the truth. Again and again Jesus tried to get them to see they were "lost sinnners" like any other person. But they were proud and eventually plotted to have Jesus killed because Jesus was a threat to them as leaders.
The Romans did not see Jesus as a threat. To them he was an insignificant figure in a small backwater of the Roman Empire (Judea). Jesus was seen as a threat by the Jewish priests, not by the Romans.
the Romans thought that Jesus was a threat to the roman government
See the link below. There is a list of miracles by Jesus.
Jesus Christ was not percieved as a threat to Roman Officials. He was percieved as a threat by the Jewish Pharisees in the area he preached. They used threats of rioting and violence against the Roman Officials, namely Pontius Pilate, to have him executed. The Pharisees were comprable to Bishops in the Catholic Church, and believed that if Jesus amassed too many followers they would lose power amongst the Jewish people.
They were jealous that Jesus spent time with the ordinary people. The scribes and Pharisees thought they were the spiritual people of that time. Again and again Jesus showed them that they were far from the truth. So they criticized Him and eventually had Jesus killed. But that was all part of God's plan.
He was perceived as a threat to the religious and political establishment and under the political/religious laws at the time, was sentenced to death.
Jesus liked simple humble people, as you see all his disciples were simple people and so were his friends like lazrus.