What is the ruling on carrying weapons for self-defense in light of the security breakdown, and is it permissible to assault a criminal with it if he attacks a person?

Carrying a weapon differs in ruling according to the intention. If a person is subjected to assault and finds no means to defend himself, his property, and his honor except with a weapon, then there is no blame upon him for that. Its ruling at that time is the ruling of repelling an aggressor.