Crime in Greece is one of the lowest in Europe and is one of the safest countries in the world. This is not to say that crime does not exist. It certainly does. However, the majority are petty crimes as armed violence and random assaults are fairly uncommon. Gun control is strictly enforced and possession of firearms of any type, except those licensed for hunting, is forbidden. This may play a large part as to why crime is not as high as in other countries where owning a gun is legal.
You don’t see police often in the streets, nor do you see them on freeways or roads much while traveling. The only time they may be out in full force is during a holiday when traffic is congested due to Greeks traveling the roads.