There are some problems that a person or a country that can only be solved by violence but not all of them. For example, if life is in danger and the only way to save it is violence, and then we dont have other choice. Also there are some other reasons that you could use violence to solve some problems like if there are threats that are very severe, you could use violence. But if the problems are not very important and you just want to use violence because you just feel like doing it, it's not fair to other people because you dont know what they could have done or been in their future.
What I think is that we are all here to die, killing is not fair but somebody have to do it. It's like we are all cursed and the only thing in our mind is violence when we have to handle some problems and there is nothing that nobody can do about it because each day that goes by a killer is born as a peacemaker is also. It's like our entire destiny. Sometimes, a person uses violence with any purpose and sometimes this same person could be the one to keep another person away from doing it, I think it all depends in what situation the person is. What we have to understand is some people use violence for fun and some have reasons to do it but me I think that as long as it's a problem for you and your life, you have to do what you have to do because nobody wants to have any kind of problems that put either them or their life in danger and that's why I practically agree with the people that use violence to solve problems.