The world needs authority. The world needs the Catholic Church.

“By what authority are you doing these things? Or who gave you this authority to do them?” (Mark 11:  28).

You guess right who the above question is directed to.  Of course Jesus.  Who are the questioners?
"As he [Jesus] was walking in the temple area, the chief priests, the scribes, and the elders approached him and said to him.... “ (Mark 11: 27 - 28).

This is a good opportunity to see what the Bible says about Authority:

First, all authority comes from God. (Romans 13: 1). This is all sweeping:  authority of the federal, state, local governments and everything downstream.

How about the the authority of Jesus, the Son?  “All power in heaven and on earth has been given to me."  (Matthew 28: 18). "Power" = "Authority".

Authority of the Church: 
#1 "The eleven disciples went to Galilee, to the mountain to which Jesus had ordered them...... Then Jesus approached and said to them, “All power in heaven and on earth has been given to me.  Go, therefore, and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the holy Spirit,  teaching them to observe all that I have commanded you. And behold, I am with you always, until the end of the age.”  (Matthew 28:  16 - 20).

#2  "Whoever listens to you [Apostles] listens to me. Whoever rejects you rejects me. And whoever rejects me rejects the one who sent me.”  (Luke 10: 16).

#3 "And so I say to you, you are Peter, and upon this rock I will build my church, and the gates of the netherworld shall not prevail against it.  I will give you the keys to the kingdom of heaven. Whatever you bind on earth shall be bound in heaven; and whatever you loose on earth shall be loosed in heaven.”  (Matthew 16: 18 - 19).

On the question of authority, how confident will you be for a surgeon without license (authority) to operate on your only son? Or a lawyer without license to represent you on a felony case?

The world needs authority. The Sanhedrin was the supreme court of Israel.  In the USA, we respect the Supreme Court.  You may not always agree with them, but you understand the wisdom of the existence of the institution.
Why should it be different with the Church?  The Church is the Seed of the Kingdom of God here on earth and Jesus provided the Church with authority.

"Trust in the Lord with all your heart,
on your own intelligence do not rely; In all your ways be mindful of him, and he will make straight your paths." (Proverbs 3: 5 - 6).

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