Thank you for your reply Wolfpmd3, I agree with "There are people who are desperate to leave their home country, so staying in Canada illegally is not such a bad alternative to them"
Yes, What you said is totally correct and for sure, we all would like to obey the rules.
Thoughts-sharing: I just feel it a little bit unfair here for international students, I mean there are a lot of international students who have high education levels and quite good financial conditions/current assets at the same time, and they want to remain in Can after finished their study period, why VOs usually think about them negatively? Is this a bad thing if they want to stay in Can legitimately and would like to get good jobs as well as willing to give benefits to the country/community? Meanwhile, there are a lot of locals who are homeless, unemployment because of laziness, and smoke w*** everyday that we could see a lot in some random city-parks