Famed activist investor Carl Icahn took aim at the leadership of his latest target, Southwest Gas (NYSE:SWX), on Monday, calling the firm's top executive "a terrible CEO" and an example of an "anti-Darwinian" principle guiding corporate promotions. In an interview with CNBC, the chairman of Icahn Enterprises (NASDAQ:IEP) also discussed the overall markets, highlighting the dangers of increased inflation and saying he "can't understand" Bitcoin (BTC-USD). Late last week, Icahn announced that he plans to launch a tender offer for Southwest Gas (SWX), valuing the company at $75 a share. The outspoken investor also plans to stage a proxy contest to elect his allies to the firm's board of directors. Icahn was stirred to action by SWX's decision to buy Questar Pipelines from Dominion Energy (NYSE:D) in a deal valued at nearly $2B. In the CNBC interview, Icahn called the attempt to takeover Questar a sign of the "arrogance" of