In the case of the Planned Parenthood shootings, we even have post-shooting rationalizations:
In the case of San Bernardino, in a staged conference with a brother-in-law, CAIR rushed to explain the motives of the killings were unknown (read, probably not linked to Islam) when the religious radicalization of Zayed Farooq should have been known to a brother-in-law.
And the shootings in Paris were of the same ilk. Decidedly: