That's the best way to prevent any crimes like that to happen again. So, what do you think if the punishment just 1 week? The robbers will say "come on we rob him/her, at least we will be sentenced just for a week".
[/quote

I think the point is not the the length of the sentence but the willingness of the thieves to risk it. Maybe they're unaware, which is unlikely, but in any case, it's scary how people have no realization of consequences of their actions.