Very tough call. The fact they were allowed to work in a sawmill this long without it being a WCB requirement is shocking in my opinion.
The article does say "They said they haven't worked since November, when their employer brought in a hard-hat-only policy aimed at lowering injury rates in the workplace. Interfor requires the two men to wear hard hats over their turbans."
I think when it's a safety issue safety should come before religion - at least when it can affect other people. Sawmills are dangerous places to begin with, (hypothetically) if someone operating heavy machinery gets injured due to a lack of proper head gear, a few people working near them could get hurt or killed as well.
While I'm not religious I can appreciate that these guys don't want to undermine their beliefs. This is definitely a human rights thing now though as the company offered them other jobs at the same pay in areas where they wouldn't require hard hats.
I guess it comes down to - when your beliefs could have an affect on you as well as the safety of those around you, who's rights come 1st? If I start my own religion and part of it is that you must be drunk while driving, should I be put above the law? (ya it's extreme, but you get the point)