Christ & Martin Luther Drive Out The Moneychangers & Merchants From The Church

Many people are perplexed by Jesus taking a whip and driving out the moneychangers and merchants from the Temple. Why would meek and mild Jesus, who surely loves everybody, do such a thing?

Was he making a statement against capitalism?

How is what Jesus did similar to what Martin Luther did?

What exactly DID Martin Luther do?

What is the key difference between Roman Catholicism and Protestantism?