Well, serial murderers/rapists are really very rare, so most police departments really have very little experience in dealing with. In many cases they don't even think they've got serial crimes at first. How many people did Ted Bundy or Jeffrey Dahmer (just to name a couple of famous examples) kill before the police involved clued into the fact?
What I can't forgive is the bumbling by the prosecutors office, and especially their failure to void the deal made with Homolka after it became clear that her deal was based on lies. Their indoctrination in the feminist dogma that women are always victims also contributed to this. I also can't forgive Bernardo's lawyer who sat on the tapes (which admittedly the cops should have found) that would have given them the evidence they needed to put both of them in jail for life. This same attitude is what led to Karla spending her days in jail in what could really only be called a country-club prison - that if women commit criminal acts it's only because they are victims themselves.
Personally, and I know I shouldn't, but I kind of hope someone sees fit to take her out with a bullet through her head from a scoped rifle from 500 yards. Heck, I bet the even the cops wouldn't even exactly bust a gut trying to solve that crime.
Here is a description of two psychopaths working together:
"(They) usually don't get along well with one another. The last thing an egocentric, selfish, demanding, callous person wants is someone just like him. Two stars is one too many. Occasionally, however, (they) become temporary partners in crime - a grim symbiosis with unfortunate consequences for other people. Generally, one member of the pair is a "talker" who gets his way through charm, deceit and manipulation, whereas the other is a "doer" who prefers direct action, intimidation and force. As long as their interests are complimentary, they make a formidable pair".
Source: "Without Conscience" by Dr. Robert Hare (page 65)
I guess Canadians also need to watch her future partners.