What, do you think, ought to be reported, by law?
If a person is talking about going out and doing a mass shooting, ambushing cops, etc then it should be reported. I forget how the law reads but I think if they are a clear danger to themselves or others is close to the wording. Yes there is the possibility of abuse which is why pro-gun people need to work on the issue instead of anti-gunners. We have a choice people and all the libertarian pipe dreams in the world are not going to help. We either find a way to fix the problem while preserving every right we can for the sane, law abiding gun owners, or we watch as we get demonized until we have no gun rights.
And reports are that the guy today has mental issues. Luckily not a real gun or we would be hearing about another mass shooting.
Man killed by police in Tennessee theater had 'significant' mental issues
http://www.foxnews.com/us/2015/08/06/shots-reportedly-fired-at-tennessee-movie-theater/?intcmp=hpbt1