Arbitrariness in the application of the rule of law is indeed a fundamental cause of poor governance, undermining the very foundations of a just and orderly society. The 'rule of law' implies that all individuals and institutions, including the government itself, are accountable to laws that are publicly promulgated, equally enforced, and independently adjudicated. When this principle is compromised by arbitrary application, several negative consequences arise:

1. Erosion of Trust: Arbitrary application means laws are applied inconsistently, based on personal whims, biases, or political influence rather than established legal principles. This destroys public trust in government institutions, particularly the judiciary and law enforcement, as citizens perceive unfairness and partiality.
2. Unpredictability and Insecurity: A system where laws are applied arbitrarily creates an environment of unpredictability. Citizens and businesses cannot rely on consistent legal outcomes, leading to insecurity, discouraging investment, and hindering economic development. Rights and obligations become uncertain.
3. Corruption and Abuse of Power: Arbitrariness provides fertile ground for corruption. Officials can exploit their discretion to demand bribes, favor certain individuals or groups, or abuse their authority without fear of consistent legal repercussions. This perpetuates a cycle of impunity and injustice.
4. Undermining Accountability: If laws are not applied equally and consistently, it becomes difficult to hold public officials accountable for their actions. This lack of accountability can lead to inefficiency, negligence, and further abuses of power.
5. Social Instability: Persistent arbitrary application of law can lead to widespread public discontent, social unrest, and even political instability, as marginalized groups feel systematically disadvantaged and lose faith in the state's ability to provide justice.

In essence, the rule of law is the bedrock of good governance, ensuring fairness, predictability, and accountability. Arbitrary application shatters this bedrock, leading to a dysfunctional state characterized by injustice, corruption, and a breakdown of social order.