Capital punihsment doesn't help the convict to live a crimelss life where a jail does.

I do take not that jail is described as deterrence and that a proper "no argument to the stick" line would want to abolish that. However if we are going to discourage people with negative consequences jail has less downsides to it than capital punishment.

I do come from a part of the world where rehabilatory stances are taken more seriously and the prison conditions are kept way more orderly (which like takes money). I can speak only for my half on why I approve having jails around and how I would like them to be run. US type prisons are very in line with the will of the voter but I disagree with the popular stance there to handle prisoners.

In a documentary apparently one inmates motive for the crime was to be incarcinated in order to buy their drugs at prison prices instead of street prices. While I understand this from the convicts point of view I don't think that any system that allows this to happen is a good one. While you can't 100% remove them because the smugglers have pretty good incentives to try, if it is too much accepted as a inevitability the countermeasures can be too lax.