Summary: Man needs freedom to act. Freedom requires the adherence to absolute boundaries. This adherence requires self constraint, which requires mutual trust. But this mutual trust can be broken: unilaterally.
And man has no rational justification for self constraint, unless the cost outweighs the benefits. Moreover, man competes for power and control. This results in a downward spiral towards destruction. This is the human contradiction of life. And you are part of it.
The prisoner's dilemma
Freedom requires the adherence to absolute boundaries, like the respect of your life by others. But mankind itself cannot provide a source for the absolute boundaries needed for freedom, which is needed to live.
On the individual level, a man can only establish his own rules. But his rules are not absolute. His rules will be:
At the collective level, national and international, the same principles apply. (Like a brick wall consists of the individual bricks in it: it is only a matter of scale.) It follows that mankind is unable to secure freedom, action or life.
Your trust can be broken. In light of the fragility and finiteness of a man, he cannot afford his trust to be broken by any other man. Because this would limit his freedom, action and life, which could result in his death or lead him closer to it. Therefore, he cannot rely on the self constraint of other persons. This means that:
There is no rational justification for a man to exercise self constraint, unless it would cost him.
In principle, violating another man’s entitlements can be very beneficial to the man that is both willing and able to:
The limited time that a man has provides a compelling argument to live at the expense of others, rather than allowing others to live at his expense.
Power and control
The increase of one man's power to act correspondingly decreases the power of other men to act.
This power shift is in constant flux.
This means that the fittest can survive and thrive at the expense of others until they are removed by those that will be the fittest until they are removed. Etcetera. It follows that the fittest will not survive. Neither will the unfit. This competition for power and control is inherently destructive. This means a downward spiral. Not towards life, but towards death. This is the human contradiction of life. And you are part of it.