For what is this..?

Tweet

In recent months in the United States there have been many attacks with firearms, in schools where many children and adolescents have died, not only in school but in any public place, which leaves me thinking about the freedom that everyone has to have firearms here in my country there has been no carrying of weapons for many years... but thieves do have which is contradictory but that is the reality here, I wonder what has led to so many attacks with firearms in the United States and what are they doing to try to avoid them?