If you confuse rational thinking and politics your arguments make sense. These weren't Syrian refugees and they may have targeted his workplace because Karl's a dick and steals his food (or some other dumb reason).
You have a president one week removed from trying to tell people ISIS isn't coming with refugees and don't be afraid of women and children who's now standing up saying "wait and see" it could be workplace violence rather than terrorism. While pushing gun control as if this shooting is the same as any other shooting when it likely has more in common with the Boston Marathon bombing.
Here is a DHS "vetted" woman from the middle east who came here, armed herself, took up kitchen bomb making as a hobby, was part of a plot that shot and killed a bunch of people, and pledged allegiance to ISIS. Commiting the crime with a state government employee who I assume was screened at some point. Yet, the White House's position is it wouldn't happen with the people actually coming from ISIS controlled territory. It doesn't take a lot to convince voters that Obama's position is not sound.
We all like to say the left is great at loosing elections they should win. I have a feeling, a couple more of these types of events and Obama won't be standing next to many candidates in the next election cycle.