Protesting 2/7 only is short sight, will not change the real problem, because there are limited victims.
When you say "非法移民太猖獗", you are also wrong. The reason 非法移民太猖獗 is also because of the policy.
Now if you only protest 2/7, you will not get support as a whole. I will support you if you also protest the root cause, not just 2/7.
2/7 will be forgotten soon no matter how hard you try to protest. Once visa number is available, no one will protest anymore, including you; but the root problem will be still there if you don't fight.