Another random shooting erupted

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Could you believe what you hear on the news? Another shootings, kill 13 people in the immigrant center, including the shooter who kill himself on the scene. I just wonder is our society's fault, or the system's fault. These people might go through extremely pressure in life, they are more likely to pick the extreme method at the end. Meanwhile, we allow any one to easily access guns. We made guns sell available anywhere, and everywhere. When people lost their mind, they use it to solve whatever problem they have. Is it right?