Because it doesn't affect you or any other person or organization that doesn't have legitimate access to classified information.
The key words here are "unclassified government systems". There are rules and procedures to make sure that the classified stuff stays on the classified systems, and one of those, very sensibly, is that classified stuff shouldn't be on the unclassified systems.
The key words here are "unclassified government systems". There are rules and procedures to make sure that the classified stuff stays on the classified systems, and one of those, very sensibly, is that classified stuff shouldn't be on the unclassified systems.