Hi Adam, welcome to the board.
Actually, I share that thought with you because after Columbine, the school shootings increased a lot and you can read about recent mass shooters inspired on Columbine or about kids planning massacres very similar to Columbine. I think that Columbine marked a generation and influenced another, maybe another similar case would started the same or not but the impact of Columbine and the popularity of the case, definitely made that many guys could feel attracted to the case because they feel identify with Eric and Dylan and share many of their thoughts or experiences and not only them, many other people too. However, we dont know exactly, if another school shooting would cause the same like Columbine but I believe that Columbine really started something and if Columbine wouldnt happened at all, then another similar case would have to be like Columbine, have that same impac to caused the same and that case would happen sooner or later because there were other shootings before Columbine and that idea already existed.
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The most terrifying fact about the universe is not that it is hostile but that it is indifferent; but if we can come to terms with this indifference and accept the challenges of life within the boundaries of death — however mutable man may be able to make them — our existence as a species can have genuine meaning and fulfillment. However vast the darkness, we must supply our own light