The desire of politicians to retain power by all means is complex and multifaceted, and can vary depending on the specific context and individual motivations of each politician. However, some common factors that may contribute to this desire include:

1. Personal ambition: Many politicians are driven by a strong desire for personal success and recognition, and view political power as a means of achieving these goals. For such individuals, retaining power may be seen as a way of maintaining their status and influence.
2. Ideological convictions: Some politicians may be deeply committed to certain political ideologies or policies, and may believe that their continued presence in power is essential for advancing these agendas. In such cases, retaining power may be seen as a way of promoting what they perceive as the greater good.
3. Fear of consequences: Politicians who have engaged in corruption, abuse of power, or other unethical behaviors may fear that relinquishing power could lead to exposure, legal consequences, or other negative outcomes. In such cases, retaining power may be seen as a way of avoiding accountability.
4. Pressure from supporters: Politicians may face pressure from their supporters, who may view them as essential for protecting their interests or advancing certain causes. In such cases, retaining power may be seen as a way of fulfilling the expectations of their base.

Overall, the reasons why politicians want to retain power by all means are often complex and multifaceted, and may involve a combination of personal, ideological, and situational factors.