Aidan Walker -- an expert on memes and internet culture -- says "incel culture" comes from a sense of hopelessness about the world ... and, social media eggs the negativity on.

We spoke with the writer and content creator on "TMZ Live" Monday ... and, we asked him about what sort of impact the internet and meme culture may be having on violent acts perpetrated these days.

Walker says memes are just a way for younger people to communicate ... and, it's so influential because it's all-encompassing and collaborative -- one person makes the pictures, the words are changed, people like and comment, and on and on it goes.

Cops have accused Tyler Robinson of killing Charlie Kirk with bullets engraved with meme language ... and, Bill Maher -- who also had Aidan as a guest -- explor

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