We should punish bad behavior.

Reasons to agree

1. Rational people will avoid a punishment. If so more good things will happen.
2. Rational people will seek out rewards.
3. We tried to punish Germany after WWI. Some people said that their hopeless state, caused by the punishment, helped motivate them to start WWII. I think these people are stupid. Germans were still living much better lives than those in South America. Just because they had a lot of debt to repay, didn't mean that they had to start gassing Jews, and invading their neighbor. When America went through the great depression, crime actually went down. We didn't invade our neighbors, when things got bad. It is over simplistic to blame ourselves, and say that our punishment of Germany caused WWII.

Reasons to agree

1. It is difficult to decide what is good behavior and what is bad behavior. 

Related:

1. We should punish bad behavior.

Examples of trying to punish bad behavior:

1. We should tighten economic sanctions against Iran.