The Palestinian 'lobby' really do behave as if they have no brains.
At best Israel is engaged in war crimes and massive (attempted) ethnic cleansing at worst it is engaged in genocide.. The government is losing support bigtime by claiming there is no starvation in Gaza amongst other things.
Thus people see the problem in Gaza in a very sympathetic light. This should be a slam dunk for the Palestinian lobby yet they are doing their best to change this.
Invading a restaurant in Melbourne and shouting slogans to peoples faces is not winning any new friends. Indeed it is losing potential friends and even current friends.
Wanting to march on the Harbour bridge is highly unusual ( I can only recall it for a reconciliation march back when Howard was PM) . Not only are demonstrations rarely held on the harbour bridge it also hits motorists hard of which there are a large number in Sydney.
Demonstrations held in Australia are held to attempt to influence governments. Please cogitate on that