美国的斩杀线为什么火起来了，一方面曾经需要移民建设，另一方面特朗普开始讨厌没钱移民，这背后是美国制度的精准筛选与淘汰机制

Core Viewpoint - The concept of the "kill line" has gained significant attention, representing a threshold in society where individuals are deemed disposable once they fall below a certain financial status, leading to systemic exclusion and permanent removal from societal support [1][3][10]. Group 1: Economic Conditions - According to the Federal Reserve's 2024 Economic Conditions Report, 37% of American adults cannot access $400 in emergency cash, indicating that over one-third of the population lives on the edge of financial disaster [3][7]. - A cycle of poverty is created where lack of money leads to poor credit scores, which in turn restricts access to housing and employment opportunities, further exacerbating financial instability [4][6]. Group 2: Immigration Policies - The current U.S. immigration policies reflect a shift towards valuing "wealthy contributors" over low-income labor, as seen during Trump's administration, which has led to a more stringent and calculating approach to immigration [4][6]. - The use of economic calculations in immigration enforcement, such as the cost of detaining individuals versus providing them with a one-way ticket home, highlights a shift towards viewing individuals as economic units rather than human beings [6][10]. Group 3: Homelessness and Social Issues - The phenomenon of "employed homeless" individuals, who are often well-educated and previously high-earning professionals, illustrates the growing issue of homelessness among the middle class due to systemic failures in addressing high living costs and healthcare expenses [6][9]. - California has spent approximately $24 billion over the past five years on homelessness, yet the number of homeless individuals continues to rise, indicating a failure to address the root causes of poverty [7][9]. Group 4: Societal Implications - The average life expectancy of homeless individuals in the U.S. is around 50 years, significantly lower than the general population, reflecting the severe consequences of falling below the "kill line" [9][12]. - The treatment of individuals who fall below the economic threshold mirrors corporate practices of optimizing labor costs, suggesting a broader societal trend of valuing individuals based on their economic contributions [10][12].