So far, only one person has been confirmed to work there. Assuming that doesn't change, then there has to be an ulterior motive. You wouldn't get two other people to attack your work place with you unless you all were wanting to simply senselessly murder people as terrorists or you had a political ax to grind.
At first, I was thinking that because the public health department provides access to contraception, morning after pills and "referrals" for other similar services that it was likely to be another nutty conservative white dude frothing over abortion. It still could be motivation along those lines, but it doesn't necessarily fit the profile of what would motivate multiple people of (presumably) Middle Eastern descent. At the same time, going after a public health department really isn't the ripest target, as others have already pointed out.
Whatever the case, I'm loving how conservatives instantly pivoted from "OMG FALSE FLAG OBUMMER GONNA GET OUR GUNS #WAKEUPSHEEPLE" when they assumed it was a white dude to "OMG ISIS INFILTRATORS LET'S OVERREACT TO THIS VERY REAL EVENT #SHEETOFGLASS" after they found out there were likely Muslims involved.
The "red pill" demographic does that every time an event like this happens. If the shooter was white, false flag to take our guns. Shooter wasn't white, legitimate event. It's almost like they are crazy and irrational.