I can only speak of the U.S. and the city and states that I've lived in.
Most fights are probably random. I don't think anyone wakes up and thinks. Today I'm going to get into a fight. Even those who carry guns for protection probably don't think either. Most of the time it's the random chance that 2 people who rub each other the wrong way are going to settle it with a fight.'
Most weapon violence is probably planned intent. It would be someone with a plan to use a weapon, so when things get heated they don't back down or try to defuse the situation. Deep down they don't want things to calm down, they want things to hit the boiling point and to come out on top to prove a point that is insignificant after all is said and done. For the most part these people have an idea of who they want to shoot either specifically or in general such as, race, gender, or people they think of as belonging to the group that they don't like.
In comparison to targeted weapon attacks and self defense attacks, the targeted weapons attacks are numerous. Even though that's bad, a person is more likely to be in a random hand to hand attack on the street. I look back of all of the conflicts I've had on the streets, and think just how many of those would have been fights had I not been good at calming things down. I would have easily been in more than 20 fights in my life. .