Why can't drones defend the colony?

Drones may struggle to defend a colony due to limitations in decision-making capabilities, as they often rely on programmed responses rather than adaptive strategies in dynamic situations. Additionally, their effectiveness can be hindered by environmental factors, such as obstacles or adverse weather conditions, which may impede their operational efficiency. Lastly, drones typically require a reliable communication link and power source, which could be compromised in a conflict scenario, rendering them less effective in defending the colony.