Marrakesh is a fairly safe city, as is most of morocco, Violent crime is relatively very rare, particularly compared to USA.

You are probably more safe in Marrakesh than most other European cities.

Several years ago the authorities set up a tourist brigade police force, whose main objective is the safety and well beign of foreign tourists, Naturally like any touristic city, there is opportunistic theft, i.e.a mobile phone or camera left on a street side café table while having coffee is likely to disappear if you don’t keep an eye on it. But in terms of safety, you should have no fears what so ever, even walking around late at night you are perfectly safe.