Jesus DID come to preach the love of God. He ALSO came to point out that we are ALL sinners and in need of forgiveness for those sins. It is the Word of God that condemns us, not the person who repeats what God has said. I can say, "If you are a murderer, then you are worthy of death", because this is what God has taught. It is not MY judgement, but God's. I am only repeating what He has said.
Jesus hung out with "known" sinners like tax collectors and prostitutes. When he called them to repentence, they readily admitted their guilt and asked for forgiveness, because it was easy to see that they had sinned.
Jesus saved his scathing denunciations for the religious leaders of that day. These leaders had rules and teachings and ceremonies and believed that, somehow, if they did everything correctly, then they were righteous in God's eyes. They were prideful and Jesus told them that while they presented a good appearance on the OUTside, their HEARTS were not repentent. Internally, they were full of SELF-righteousness. Their public life was all rosy, and they knew it, but they had sinned in secret places thinking that nobody else knew.
It is just the opposite today with the Liberal Christians in this country! They are the ones who promote and encourage other people to engage in sinful behaviour. You think Jesus Christ used some scathing denunciations toward the religious leaders of that day wait till he gets his hands on the people in this country!