I also have a mosque at the head of my street, which was previously a Jehovah's Witness church. The Sikh temple was previously a Masonic temple, so neither of them really fits preconceived notions about appearance.
Also, the Ahmadiyya Muslims at the mosque frequently have a full parking lot on Sundays. Not sure what they're up to, but they're there in numbers.
But as to your point, there's nothing really indicating as of yet that this skinhead whacko mistook the Sikhs for Muslims. To him, like I said, maybe they were just dark-skinned foreigners with rags on their heads.
The Dems/leftists/media (but I repeat myself) want to push the “He thought they were Muzzies” which is most likely not a fact. Already on the SPLC site (there was a link on a thread yesterday), leftists PiecesOS are saying that Michelle Bachmann’s hatred of Muzzies is fuelling this kind of “thing”. It’s all because of anti-Mozzie bigotry. They are drooling over this.
Weapons training, bomb building and Jihad 101?
There was a funny incident in Australia, a few years back, where some dumb and offensive yutes decided to give a “Muslim” a beat down. So they set upon a guy in a turban, and he had to run away - yes, he was a Sikh. He outpaced the fat bullies, so they crossed the road, and vented their rage upon a group of swarthy men who had a felafel stall.
They were Israelis.