That is a very good question. When we are discussing a situation like that, we have to remember that essentially two kinds of taxpayers use tax havens. There are individuals who are simply trying to avoid paying tax by hiding money in offshore accounts in tax havens. Then there are multinationals who are, by legal means, not paying what might be considered their fair share of taxes.
If you increase the penalties, you are going to target the taxpayers who are hiding money in tax havens. There, yes, it is a good idea to increase the penalty as a deterrent, in an attempt to limit the attractiveness of tax havens. But I think that there must be measures on the other side too. Otherwise, the risk is that some taxpayers will be made to suffer simply because they are the ones who have been found out. The measures in place are largely aimed at tax evaders, and they are mostly private individuals.