Was the P.O.T.U.S. inconsiderate by using the Dallas police killings to promote his gun control lobbying?

A tragedy should not be used for any political agenda. Offer condolences and prepare a plan for a solution to be announced after those who have parished have been laid to rest at the soonest.

Opportunistic, yes.

The Community Organizer-in-Chief has an agenda. As long as he has his base of "Useful Idiots" in the audience to cheer when he is out, they'll listen, the media will cover it and the people without computers who can't check it and still watch network news (CBS, NBC, ABC) just mindlessly believe it. The progressive/Liberals know how to use the ignorance of the viewers.