Not truly relevant for future attacks.
Each one of these guys is a special little snowflake...
To paraphrase Tolstoy and happy families, each of these mass murderers is crazy in his own way.
If we figure out that this one is unhappy about the environment and figures focusing on shooting immigrants is going to fix that, it doesn't help us prevent the next shooting. Because the next shooter will be unhappy about plummeting sales of tiki torches and think shooting Jews will fix that. And the one after will be unhappy about lack of coal jobs and think shooting the gays will fix that.
The commonality is very simple... They want to take their rage out on some group if "others". The details that make up their rage is irrelevant, because the next shooter (and there will be a lot of next shooters) will have different details.
victor809 wrote: