I'm a supporter of Australia's gun laws, but not a supporter of this kind of over-the-top restrictions for, what I consider to be (and that's the rub), the trivial / minor offense of protesting.
The protection of "the economy" is paranoia-level, which doesn't bode well. Corruption is a transaction that encourages more transactions, whilst protest is only ever a restriction, therefore if the economy is the priority then protest is a worse crime than corruption.
No wonder there are climate protesters...