I did nothing more than what the parent comment did.
I also don't think we're in a position to judge the full impact of our words on others, so I don't accept your assessment that no minds were changed by the previous discussions.
Nobody's telling you not to express your view. The obnoxious thing is to snidely pretend everyone else has to justify their own positions in terms of your view.
If you want to say, "taxation is theft", just say it, instead of dragging things out from, "Well why should children have equal opportunities to other children anyways?"