Shalom, yes, I somewhat agree with you, it could be increased a little bit, for instance anything between 5 to 10 clicks.
This can still be abused
However I think that if the person is going to post a controversy topic, he/she should take care how he/she is expressing himself/herself so that anybody who disagrees will still not be offended to be point of pushing the button.
Whoever is posting the topic doesn't always have control over that. For example, in politics, things get heated very quickly. If someone posts something pro-Democrat, you may get 10 people who happen to be pro-Republican 'reporting' this person, or vice-versa.
The best thing is to do what is already being implemented...have a report feature, and when someone reports something, a moderator/admin takes a look at it and they can decide for themselves.