The actual things most people are concerned about aren’t even close to being zero sum- things like economic activity increase with more people and ingenuity. We’re in a time when innovation is rapidly letting us do more with less resources, we aren’t resource constrained for our real world quality of life. Rhetoric creates us vs. them situations that don’t exist in fact- while also artificially constructing groups to pit against one another along lines that only benefit the person creating them. Even if I did think things were zero sum and wanted to use government force to keep resources in my group- the “in group” I would choose isn’t the one any politicians are trying to sell me based on what people look like or where they were born.