But in my opinion, there is no such thing as absolute freedom of speech in public places (like this forum) because your freedom sometimes will violate someone else's rights.
Do you have an example? Your answer would depend on what you consider "rights".
-Utilitarian: do we need to calculate the cost/benefit analysis (for the greater good)?
Morality is subjective but I think utilitarianism is the worst way to plan out morality. "Happiness" is very loosely defined and if you really want to maximize it, you would mass-produce humans, force them to do meth constantly, and enslave them to happiness. A cult of happiness.
-Negative rights: should "x" be left alone?
What does that mean? Negative rights?
-Moral sentiments: how about we put ourselves in the "x" shoes?
An apt way to look at it, though what happens when you put yourself in the shoes of an unstable or mind-atrophying individual?