Musk has frequently said that the shared mission of all his companies is to advance humanity, be it by reducing emissions in the atmosphere through Tesla or expanding civilization into the stars through SpaceX.He has also used his replies to highlight his concerns about a societal collapse arising from a declining population.Musk has 10 known children, most recently fathering two children in 2021 with an executive from his brain-interface company, Neuralink.Despite conceiving most of his children through fertility treatment, Musk cut fertility benefits at Twitter following his acquisition. According to emails seen by Insider, Twitter informed employees late last year that a benefit covering up to $80,000 in lifetime costs related to various fertility-related needs and treatments, along with the costs of adopting children, was being reduced to a maximum of $40,000.Another Musk-favorite reply uses simple emojis — specifically, the rolling on the floor laughing emoji and the 100 symbol. He employs them frequently in response to tweets he finds funny and sometimes to dismiss detractors.Musk frequently spars with the media and government agencies, and he complains about them on Twitter.Most recently, he suggested that Twitter was pressured under prior leadership to take down content at the behest of President Joe Biden's campaign. Biden was not yet president nor serving in any office of government at the time, and the campaign was requesting illegal posts be removed, so legal experts have pointed out this issue is not related to the Constitution.Musk has never been shy of making it clear he is not fond of regulatory oversight. His companies have been the subject of numerous government investigations across the world, including by the Division of Occupational Safety and Health of California and the National Transportation Safety Board.Earlier in the pandemic, Musk reopened a Tesla factory in Fremont, California, in violation of COVID-19 lockdown rules, and 450 people there contracted the virus afterward, The Washington Post reported. The shutdown helped motivate Musk's decision to move Tesla's headquarters to Texas.