Is a 4 inch knife significantly less dangerous than longer knives?

A shiv is a short knife, and razor blades are banned from airplane carry-ons.

They try to discern between common objects being weapons and it becomes situational, except for cooking utensils. For some reason hammers aren’t seen as a weapon because some people don’t know about maces or clubs.

Sorry kids, your dad can’t cut the turkey because we aren’t allowed to have a long enough knife.

Why the title edit? The original (Is a steak knife a weapon? Oregon Supreme Court takes a stab at it) fits.

The state says you can't have a knife longer than 4 inches if you are on probation.