It's not just what you traditionally think of as "welfare." Our whole economy is predicated on the assumption that populations will not collapse. This is especially true of Silicon Valley. Baked into the $50 million investment round that values your company at $500 million is the assumption that the company, if it succeeds, will have customers in the future. If, e.g., the whole world became sterile tomorrow, VC, the stock market, property values, everything would collapse.