If you think better interviews is going to fix this issue, you have way too much faith in interviews to weed out bad applicants. There is no screening process which will eliminate all the bad apples, it is wishful thinking to believe otherwise. Misplaced faith in the immigrant screening process, especially in cultural values tests, is leading to some silly conclusions about how easy it is to fix problems with immigration, many around here want there to be an easy answer, but there isn't.
Canada already has merit based immigration, and refugees are not a large proportion of immigrants to the country, we have a better screening process than most and already take more the good apples and less of the bad apples, it's not like no one in Canada has thought of trying to take in more good immigrants and less bad immigrants, that's already in place and has been for quite a while.
People who think that any bad apples getting through is just a sign that they haven't come up with a better screening process are fooling themselves, thinking the government is capable of doing something that it will never achieve or come close to achieving.