I take what he is saying to mean, "It won't be until after there have been more shootings that they will pass the laws I want," as opposed to meaning, "I want more mass shootings so that they will finally pass the laws that I want." There is a significant difference in those meanings. Only the second meaning could be seen as advocating for shootings. I don't think he wants more shootings. He just is recognizing that the momentum he seeks is not there yet.
Of course, his position is based on the ignorant belief that the children died because there weren't enough gun laws. I contend that they died because there was at least one too many. The GFSZ law is why the children were undefended and were chosen by this nutjob as soft targets.
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