I don't like the mob thing either but it's how large group dynamics on the internet work (by default). We try to mitigate it where we can but there's not a lot of knowledge about how to do that.
Also, a lot of the high karma accounts got there by posting links, or just by grinding their way up by posting a lot of comments, or because they're 'famous' for something. Karma doesn't represent any sort of unusual power or authority. If you think it does you're reading too much into it.