Remember that these same LE live in the areas targeted by the shooter. And many of their family and friends live in these areas as well.
I sincerely think that they are investigating all possible connections, whomever they may be. jmo
If not, then they are endangering not only their lives but those of their families and friends, and I do not believe they would do that just to be PC.
I have spoken to my neighbors and they do not see this as being ME terrorists. I have spoken to my brother and sister in-law (they are both in LE) and they do not see this as ME terrorists either, (AT THIS POINT, BASED ON EVIDENCE GIVEN TO THE PUBLIC!)