Elon Musk became the world’s first trillionaire June 12, his net worth rocketing to $1.2 trillion when his space exploration firm SpaceX became publicly traded, valued at more than $2 trillion. The historic wealth milestone renewed calls from some politicians to address wealth inequality and raise taxes on the richest Americans. Sen. Bernie Sanders, I-Vt., said Social Security taxes are capped for ultra-high earners like Musk. “Today, Elon Musk,…