Interior Minister Nancy Faeser earlier this month proposed allowing only knives with a blade measuring up to 6 centimeters (nearly 2.4 inches) to be carried in public, rather than the length of 12 centimeters (4.7 inches) that is allowed now.
This would ban bringing a kitchen knife to a picnic, but would it have done anything to prevent this attack? Maybe the guy was carrying his knife around openly before he started stabbing people (which would be crazy) but I suspect that he wasn’t.