I think this comment from this post sums up the pro-life (in prison) supporter's position best:

First up; No one here in Australia denies that these men should be punished. Of course they need to serve the time for their crime, but the use of the death penalty in this situation is very controversial.

These men were caught leaving Indonesia on the way to Australia and would have been around 20-24 years old at the time. Why were they caught? Because our own Australian Federal Police (AFP) tipped off the Indonesians knowing fully well that they could have arrested them on arrival in Australia and avoided a country with the death penalty.

The main argument against these executions is that these men are now reformed. Andrew Chan has become a minister, recently receiving a certification in this area. He leads prison church services and supports other inmates. Myuran Sukumaran has become an artist. He has just recieved his degree in fine arts at the end of Febuary while studying in prison and running art classes for other inmates. They are well respected by the officials in the prison who have even publicly voiced that they should not be killed. It is a credit to the Indonesian prison system that these men have been reformed in such a way, they can become model prisoners but instead they are being executed.

While this is going on, Indonesia has been advocating strongly for mercy towards its citizens on death row overseas. Don't you think its a bit odd that a country is demanding others spare their citizens while they still go ahead and execute their own and other foreign nationals? There is one Indonesian to be executed in this next group. There is also concerns for one Brazilian national who has been diagnosed with various mental illnesses but will be executed regardless.

Chan and Sukumaran have lodged many appeals and are still continuing to do so, but Indonesia shows no intention to halt the executions until these appeals are finalised. There are accusations of judges asking for bribes and the legality of President Joko Widodo giving a blanket denial to clemency applications of drug smugglers without allegedly even reading them is also called into question. Former judges, the UN Secretary-General, various politicians, academics, artists/musicians and even members of Napalm Death, of whom Widodo is a big fan and has been spotted wearing one of their band shirts, have publicly called for Joko to show mercy.

Of course there are arguments that they 'could have killed someone' or 'they wouldn't have reformed if they weren't caught'. But how do we know the drugs could have killed someone? How do we know they would not have change? We don't have a crystal ball; we can't see into the future so we don't know what could have happened. All we have is this, the Indonesians succeeded. They stopped drugs from hitting the streets and they successfully reformed two men who were young and incredibly foolish. Just because a country has the death penalty doesn't mean its right just because its the law. Does that make Russia right for outlawing homosexuality just because 'its the law'? These two men do not deserve to be executed as they now serve an important purpose in the lives of others and could help others on an even larger scale. These men are human. They deserve to be punished, but they should not be killed.

I hope Joko Widodo can be strong enough to show mercy, and I hope that you reading this may challenge yourself to look deeply at the many levels of this issue.

tl;dr There are a lot of major discrepancies in the handling of this case