A psycho tomorrow may kill my best friend with a gun. Am I responsible?

Hello, my name is Ryan and I am a gun owner. My best friend has a GF that was in a bad relationship and is now in a nasty divorce. Her ex-husband is a psycho, and so is his family, and I believe their friendship is an attempt at creating a false sense of security. They have restraining orders, but the ex-husband, I call him the enemy, is dangerous and has broken many laws and the restraining orders many times. My best friend has even been attacked by the enemy. <br><br>I just learned the enemy has been discharged from a mental institution for the second time. This means he is now eligible to purchase guns, and I believe he will do so. I believe my best friend is in real danger of being murdered by the enemy. My best friend is weakened by a medical condition and his GF is not capable of defending herself or him. They have no money for personal weapons or professional security services.<br><br>When the enemy was in the mental institution, I felt a sense of security. But now I feel that sense of security has been taken away. Should I buy a gun to protect my friend?<br><br>I remember an incident that happened when I was 7 years old, in first grade. I had a friend, Justin, who had a friend, Brian. Brian was being bullied, and Justin stuck up for Brian and defended Brian. They were no longer friends a short time later. I don't know what happened. Justin moved away not long after. I have tried to reconnect with Justin, but I have not been successful. <br><br>When I was in HS, I had a friend, Alex, who would often get into fights. I was always there for him and stuck up for him. We are no longer friends. <br><br>I had a friend, Mark, that was short in HS. I stuck up for him when he was bullied, and now we are no longer friends. I love him as a friend, though, and he invited me to his wedding. I was not able to attend, and I was sad. <br><br>At the moment, I have 4 friends I would die for. I would leap into a fire to save any of them, and I would spend my last dollar on them. I would tie a weight to my neck and jump in the ocean for any of them. We have been together through thick and thin. We have been together through feasts and famines, and we have laughed together and cried together. <br><br>I know I will have their backs until the day I die. And if I were to die trying to protect them, I know they would do the same for each other. We all know what it feels like to be a kid and to be pushed around. We all know what it feels like to be ostracized, and we know how it feels to be alone. We know, because we have been there. We know what it is like to be ostracized, and we know what it is like to be pushed around, and we know what it is like to be alone. <br><br>Recently, though, I have developed a second group of friends. Sherry, Molly, Nissa, and Claudia. We are all part of a special class. Molly and Nissa are married, and Sherry and Claudia are friends that went through the course together. We all met, and we immediately hit it off. We have a love for the truth, and we share a passion for freedom We have a strong bond, and we all have each other's backs. <br><br>I believe in defending those I care for, and I would have no problem breaking the law to do what is right. I would gladly give my life for my friends We have been through so much together, and I will never let them down. I would never betray them, and I would never let them down. <br><br>I am reminded of a quote from the movie tomorrow never dies. The quote is, "There's no news like bad news." This quote has resonated with me, because psycho ex-husband is very bad news. I want to buy a gun to protect myself and my friends, but I do not know if I will be able to protect everybody. Should I buy a gun?<br><br>Edit to add: I am not my GF's real boy friend. I am a best friend, and I help her because she is a friend, and I believe in loyalty.