There have been polls taken over the years which suggest that many Australian's are for capital punishment (some polls showed a result of more than 50% agreeing with this form of punishment). However, this would be saved for the worst types of crimes rather than drug related crimes as in this instance.
When the terrorists were caught for the Bali bombings back in 2002 the Australian public and even the Prime Minister (Howard) at the time supported and expected the death sentence for those individuals because so many Australians were killed. To me this shows that we as a society don't actually disagree with the death penalty we just disagree upon when it should be used.
The below is extracted from an article written in 2010, you can see how public opinion can change so much on a topic such as the death penalty given a different set of circumstances, you can actually see here that one of the Bali 9 members said back then that we should have been opposed to the Bali Bombers being executed.
Regarding the Bali bombers, John Howard, as prime minister, said that if the death penalty ''is what the law of Indonesia provides, that is how things should proceed''. Such statements undermine Australian arguments against the death penalty for Australians tried in Indonesia and elsewhere.
This has been pointed out by Scott Rush, one of the Bali Nine, who is facing death. He wrote to the government: ''I don't want to be in any way political but, from a practical point of view of someone inside on death row, it makes practical and good sense to have a consistent position of opposing the death penalty without discrimination.''
Full article; http://www.smh.com.au/federal-polit...-penalty-no-shades-of-grey-20100301-pdgo.html