In the end, all discussion about social standards and policies is a discuss about rights and justice. There are philosophical tools for that: veil of ignorance and the original position.
Usually socialists favor a high degree of collective cooperation, while libertarians favor mutual beneficial cooperation. The problem with the former is to establish consensus about what is acceptable and what not, while the later opens up the door for exploitation, since two partner never have the same bargaining position.
In any case, there is no such thing as a social convention on this topic. Social conventions, as mentioned on the article on
agumentum ad populum are about rather trivial things such as etiquette and polite manners. Taxation has nothing to do with polite manners. That was my point.
The reason why socialist societies exists, is that pure libertarianism usually leads to a very unjust societies, with powerful individuals and a lot of exploitation.
Because socialist societies are a model of justice, maybe? You're either naïve or oversimplifying.