Such a brutal punishment, indeed. A guy makes a plan to kill citizens and he's just moved to another office to continue earn money extracted from these citizens.

You argued no-one was punished by losing their job. That's exactly what happened. Whether that is an appropriate punishment is a different discussion.

It was not a punishment. The guy was getting free goodies from his powerful position somewhere in the government. He proposed to kill people. He got another position with free goodies somewhere in the government.