I dislike how this issue is being handled by CBC, and CTV. Far too much emphasis is being placed on deterrance and rehabilitation. Deterrance, and rehabilitations, is nice where possible, but the chief goal of the criminal justice system is simple threat elimination.
The right is looking at this too much with an eye to paying back the criminal for his crime, and making sure the justice system seems tough in the eyes of potential criminals (and hence, in theory, acts as an effective deterrant)
The left is looking at this too much with an eye to rehabilitation, and focus' far too much on the well-being of the criminal over and above the well-being of the victim/society at large.
The problem is we have made this issue far too emotional by putting into place a punishment/forgiveness dichotomy. The degree of malice, and/or the degree of comfort, we show to criminals is not the issue here. Indeed, I would favour taking as cool, calm, and lacking in emotion, approach to criminals as possible. Not the passionate seeking of retribution, but nor the bleeding heart of mercy.
The principle goal of the justice system should simply be to keep the law-abiding public as safe as reasonably possible. It's goal should be the day-to-day continuation of smooth societal functioning where one doesn't need to worry about running into violent criminals.
Deterrance is a part of this. Rehabilitation is a part of this. However, deterrance and rehabilitation aren't always possible. For example, child rapists are almost impossible to rehabilitate - they have a simply horrendous recidivism rate. On the other hand, those on the left are right when they say that criminals usually don't think about what sentence they might have to serve before they commit their crimes. Most of them simply think they'll get away with the crime anyway.
The strictness of the sentencing isn't going to have much of a deterrance, one way or the other, on such people. On the other hand, rehabilitation attempts aren't going to have much affect on the vast majority of child rapists, for example.
We need to stop thinking about this issue emotionally, and ideologically, and more logically.
The Conservatives' policy on crime is, pretty much by default, the best one. Their focus is wrong, as is the focus of the NDP and the Liberals (and the media as well). However, their policy, if put into effect, does result in known threats - i.e. convicted criminals - staying safely behind bars for longer periods of time.
Now, some crimes - like using marijuana - shouldn't see you go to jail at all. It's a terrible waste of tax payer money to put a marijuana user/seller into jail. Anybody who engages in crimes that are not harming others and/or causing society to function much less smoothly shouldn't serve jail time. However, people like child rapists, serial killers, gangsters, repeat offenders in every other violent crime category, should be locked behind bars as long as possible, simply to keep our communities and streets as safe as possible.
The US violent crime rate has gone down NOT because people are terribly afraid to commit crimes (i.e. being deterred), but because a large percentage of the absolute number of the people in the US capable of/likely to commit violent crimes are behind bars... and staying there for long periods of time. It's not threat prevention, it's simply threat elimination. We have a known threat. We put him/her in jail where s/he simply can't hurt law-abiding citizens. If we're VERY confidant that s/he's been rehabilitated, we let him/her free. If we're not, s/he should stay there. The Conservatives - once again by no virture of their own thinking - come the closest to this viewpoint which I hold.