I was arrested for working a part-time job during summer vacation; they said I committed war crimes?

Transmigrating to a parallel world, Gu Qingzhou became a college student. He studied diligently in class and worked part-time at his family's steel pipe factory during winter and summer vacations. On the first day back after summer vacation, Gu Qingzhou was in class when a group of fully armed SWAT officers suddenly stormed into the classroom. "Gu Qingzhou, right? Come with us!" At the police station. The middle-aged policeman in a white shirt looked grave. "Tell me, what did you do this summer?" Gu Qingzhou honestly replied, "Worked part-time to save tuition, and did some small business on the side." "Small business? Selling arms to the Middle East is small business? What kind of small business could make you the world's ninth-largest arms dealer?" "I'm innocent, officer! I only sell legal and compliant civilian products. Look at my export orders—they're all steel pipes, gas cylinders, and small motorcycles..." "Heh, inner diameter 7.6..." "2 millimeters, a rifled steel pipe, right?" Gu Qingzhou... "The rifling on the steel pipe is indeed my fault, but a gas cylinder is a civilian product, isn't it?" "Is your gas cylinder the only one in the world that can collapse a building if it explodes? Did you stuff miniature mushroom bombs in your gas cylinder?" "Misunderstanding, this is absolutely a misunderstanding." "A model airplane with a range of over a thousand kilometers is also a misunderstanding?" The middle-aged policeman rubbed his throbbing temples. "Okay, even if all of the above are misunderstandings, what's the meaning of you forming a mercenary group overseas?"