And the cheese is made from dairy. Mayo is made with eggs. Pattie contains both dairy and egg products as well as rennet. Only the bread and ketchup is vegan.
Not everyone around here is vegan. I agree with the statement about buying the vegan or vegetarian options at take away joints. It sends out a message that there are people out here who buy this stuff, and it aims the message straight at the place which these companies treasure so much - their bank accounts.
Unfortunately this world is not built on a set of categorical ethics, so sometimes it's more productive to swallow your pride and take a more utilitarian approach. We could also respect others' perspectives - not everyone lives in a major city, and therefore convenient take away food choices could be somewhat limited. It's a doddle finding vegan take away in Melbourne, but in a small town with a post office, pub, general store and a fish'n'chip shop, you're boned.
EDIT: While I'm here, I might add that no matter what you do or where you go, you are inadvertently harming an animal somewhere. It can't be avoided these days. It's been said before plenty of times so I won't elaborate. Wanna be 100% certified cruelty-free? Move out to the bush, grow everything yourself organically, weave your own fabrics from your own organic cotton, and don't even think about using anything other than your legs for transport.