Working for the enemy

I was offered a work in a company that works for banks, those damn thiefs. To add insult to the injury, they use Java as their main language.

What should i do? Do i sell my soul to the devil for the sweet bucks?

Take the job, and make all of their computers wipe their hard drives on a Friday evening. No one will notice it until late Monday morning, and then they'll be too busy trying to crawl up their own asses to hide from customers to do anything about it. Bonus points if you can figure out a way to erase backups (or prevent them from happening for a week or two ahead of time).