There are two different topics going on here, as is often the case.
One is the law itself: harsh, clear, no exceptions, been that way for many decades. That is reality, so deal with it and don't come if you have ever had a DUI. Period.
The other is whether it is a good law. What is the rationale for such a harsh law, and what good does such an inflexible application of it do for the host country? A statute of limitations, maybe after 25 years with no further police record of any kind, probably would benefit Canada economically and not cause the fall of Ottawa. But that is soft hearted logic, with no place at Canada's border which is dealing with Asian and other immigrants.
