I think you're right, Mr. Wallace, that there's an asymmetry, that their false positives are not dealt with in the same way as their false negatives. If they keep more people out, the problems are never evident in Canada, whereas if they let the bad guys in, then they feel responsible.
One of the ways of dealing with this is I think to take the risk management approach and build it into the system, and for MPs to be supportive of that, recognizing that every now and then there will be an error. Not asking who to blame for the error but trying to fix the problem instead is therefore a way of improving the system.