Generally, yes, the wealthiest in society don't pay enough in taxes. More should be done to address that and curb their wealth.
Unfortunately right now, with the economy on the brink of recession due to the Coalition's ideological madness, it's probably a bad time to raise taxes, unless some stimulus came from elsewhere. Labor's carbon tax compensation package was the right idea. Raising taxes, mid-economic downturn, with no plan for accompanying increased spending, is poor strategy.
2 per cent of individuals are collectively paying 22 per cent of all personal income tax.