Go for it. I'm a herbivore, but I believe that animals who show unnecessary aggression don't deserve pity.
Would you know anything about the escaped wallaby in London lately?
Not until you mentioned it. I had't seen it on the local news, or the websites I normally visit.
Obviously they didn't know how bouncy and unpredictable macropods are. Maybe they mistook it for a slow-moving quadruped.
They'll have a very difficult time tracking it, let alone capturing it. Wallabies can MOVE! They're very fast. They're browsers rather than graziers, which means they can not only live on grass but also the leaves and buds on small plants (kangaroos on the other hand are graziers). He/she wont starve but they have no road-sense so a fatal accident with a moving vehicle is almost inevitable.
Apparently it's not the first marsupial escapee in the United Kingdom. There's allegedly an entire colony of wallabies living on the marshes somewhere up in the Pennines.
"The wallaby — which looks like a small kangaroo" well DUH! It *IS* a member of the macropod family.