To sue, or not to sue

I just want to say that frivolous lawsuits hurt far more people than the few individuals directly involved. They damage the system as much as they do the victims thereof. On the other hand, some people, like Benemar “Ben” Benatta, should absolutely sue for redress of grievances. I wonder, can a Canadian resident sue the US government for ill treatment by that government?

ETA: Link above has died. You can read the Wikipedia entry, such as it is, here, and a still available article from the San Diego Union-Tribune here.