The reasons why individuals labeled as "radical leftist lunatics" dislike Donald Trump are rooted in deep ideological, moral, and policy divergences. Trump's political agenda, characterized by nationalism, right-wing populism, and conservative policies, directly clashed with left-wing ideologies that advocate for inclusivity, social justice, and progressive policies. His administration's approach to immigration, healthcare, environmental protection, and social issues like racial and gender equality was seen as regressive and contrary to the values of equality, human rights, and global cooperation cherished by the left.

Beyond policy disagreements, Trump's personal rhetoric and style of leadership significantly contributed to the animosity from the left. His use of divisive language, personal attacks, and policies like the "Muslim ban" or family separations at the border were perceived as not only uncivil but also promoting division, xenophobia, and misogyny. His approach to governance, often marked by a lack of decorum and respect for democratic norms, especially around the 2020 election and the January 6 Capitol riot, was seen as a direct threat to the stability and integrity of democratic institutions, which are fundamental to left-wing political thought.
 

Furthermore, Trump's cultural and social policies, including his skepticism towards climate change, withdrawal from international climate agreements, and judicial appointments aimed at overturning progressive precedents, were viewed as steps backward in terms of civil rights and environmental stewardship. His personal conduct, including allegations of unethical behavior and a perceived lack of empathy, especially during crises like the COVID-19 pandemic, further deepened the divide. These elements combine to form a broad spectrum of reasons why those on the left, particularly those more radical in their views, see Trump as an embodiment of everything they oppose in politics and society.