That's not true. There is no state or federal government that mandates paid family leave that has to be covered by the employer. The family leave act only mandates up to 12 weeks of unpaid leave.
I was addressing incorrect assumption that longer parental leave would require the raising of taxes. I should have also been clearer that I wasn't talking about the US government(s) but for Europe and the rest of the world: Nowhere (that I know of) is the parental salary/income paid directly via taxes or by the government. Instead, the laws state that your employer should continue paying you a certain percentage of your salary while you are on maternal/paternal leave. This percentage is usually 100% , some countries have a time-based fall-off (amount decreases to X% after N weeks)