They were curious to know about Him Who was the reason for the breaking of the Sabbath law, however they were not curious to know about Him Who had healed and delivered.
Upon querying the healed man about Who had healed him and told Him to take up his bed and walk, this is what the man who was made well responded..
"The man departed and told the Jews that it was Jesus who had made him well." John 5:15 (NKJV)
Probably the Jews might have thought about how Jesus could forget the Sabbath law, it was through obedience to the law of God that they tried to please God and vainly believed that they loved God, they were not of the people who loved God first and thus love His commands too.
Our approach to God might be through something or someone, yet it should not remain so, we should stand on our feet's in God and not be supported by the crutches of traditions, rules and people.
The Jews probably knew more about God than knowing God Himself and thus they could not partake in the joy of the healing of the person, and thus were rather restricted to finding faults and errors in the blessed act of healing.
How is our faith, are we restricted to rituals and persons or do we truly love God, do we know more about Him through our traditions and functions or do we really know Him as our personal Savior?
Jesus said.." Therefore whoever confesses Me before men, him I will also confess before My Father who is in heaven. " Matthew 10:32 (NKJV)
To confess here means to acknowledge Him...to acknowledge a person, we should first know Him properly.
The Jews never acknowledged God, they had the full knowledge of religious customs and also they knew the false and baseless accusations against the Lord and thus even though they were near the temple and in the temple but never near God and in God.
Thus if God calls us to lift up our cot and walk , we should, for its He Who has healed us and who has redeemed us from sin, He will heal us and will lead without breaking any rules. We can trust Him for everything.
Thank you Brother Abraham for the lovely thoughts you expressed here and I fully agree with you. The Jews big problem was that they saw the Laws of Moses as a charm, a decoration to their race rather than a means to bring them into subjection to God. Paul said this, "Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith." (Galatians 3:24) If the Jews understood that the Law was a means to grace they would have understood Jesus and his ministry and not have opposed him at every turn. They never understood that the Sabbath was made for man and not man for the Sabbath (Mark 2:27) and so were angered whenever they thought the Law was ignored. You set out your concepts well and you handled them easily and clearly. Keep sharing your thoughts for they are worth sharing. Blessings and Love.