Billionaire venture capitalist Marc Andreessen said he decided to “double down on California” and stay in the state, even as he likened it to “living in the ruins of a once great civilization.” In a 34-tweet thread on Tuesday Andreessen, who co-founded the venture capital firm Andreessen Horowitz, said that he and his family considered leaving after a “surreal 2020.” They  bought real estate in Nevada and almost bought in Manhattan, he said. But they ultimately decided to stay, and now “rationalize” the decision by comparing it to living it in Rome before the fall.