Ideally we do not want Islamic terrorists to get guns, but there are almost always methods of attaining firearms illegally.
The fear we have of Islamic terrorism is a hell of a thing really, there have been over 190,000 homicides in the US since the war on terror began, out of which 37 have been related to Islamic extremism..
Then we need to work towards making it as difficult as possible to obtain guns, period. Legal or illegal. Ban sales of ammunition, do gun buybacks, whatever.
As for Islamic terrorism, it's still a legitimate threat to cause mass mayhem and death. Look at the Boston bombing. 3 fatalities count to your figure, but 264 injuries with limbs blown off, etc. And of course, San Bernardino.
Both are problems. Especially
if Islamic leanings ended up influencing the homophobic hate crime that this looks to be.