Was Shylock's revenge justified?

This question has been debated for hundreds of years and will likely be discussed far into the future. Shylock's revenge initially revolves around his anger at Antonio's tendency to lend money without interest.... something that admittedly interferes with Shylock's business interests. Should he seek revenge against someone who's merely a generous and loyal friend.... in my opinion, absolutely not. Should he seek monetary restitution for the money he is owed? Definitely.

In essence, Shylock's desire for Antonio's flesh is symbolic. It's payback for the way he is treated in Venice because he is a Jew, it's revenge for his daughter's running away with a Christian.... he's making a statement, and Antonio has become the tool.