Uh, what? Stolen off a Hells Angel? Where do you guys come up with this stuff? Some low level worker of that HA member would be more than willing to sell you a gun. Homeless people tend not to have guns as they can be easily sold for a decent amount of money. It's not a big problem in the USA either and you're just catastrophizing what happens when guns are available. They are widely available on the street in Canada. Same thing all the anti-gun people predicted in the USA with CCW and it never happened.
Personally I would not work in your environment without a gun but I guess that's up to you.
I've been working in this area for long enough to know that the HA are not selling weapons here(Meth is huge). By bringing a firearm into this environment you are drastically increasing the danger to yourself and others. All employees are trained and certified in conflict prevention and literally the worst thing we can possibly do is introduce a weapon.
I've never needed a weapon nor can I think of a situation were lethal force would be a logical course of action. Somehow personal arms as defense seems like a ridiculously violent solution. When is using a gun against somebody every actually necessary? In extreme cases I could see everybody having guns leading to maybe 5 people saved and 9 people killed and I don't think it's remotely worth it. I'm perfectly happy with our current gun laws and I don't want to see them banned either but, I truly wish they don't become more accessible because you don't need a weapon.
Thankfully in London we only had 9 murders with guns this year and most the shooters were hooligans from Toronto flexing their firearms over poorly chosen words at parties.