But who has any right to find of existence in present

Determining who has the right to find existence in the present is a complex philosophical and ethical question that varies depending on cultural, legal, and moral perspectives. Here are a few considerations:

Human Rights:

From a human rights perspective, every individual has the inherent right to exist and lead a dignified life. This includes the right to life, liberty, and security of person, as enshrined in international human rights instruments such as the Universal Declaration of Human Rights.

Legal Rights:

Legal frameworks in different countries confer rights and protections to individuals based on citizenship, residency status, and other criteria. These rights may include access to healthcare, education, housing, and employment, among others.

Moral Considerations:

Morally, many people believe that all living beings have the right to exist and thrive, regardless of their species or status. This perspective emphasizes empathy, compassion, and the intrinsic value of life.

Social Contracts:

Societies often operate based on implicit or explicit social contracts that outline the rights and responsibilities of individuals within the community. These social contracts may vary depending on cultural norms, historical contexts, and societal values.

Environmental Rights:

In addition to human rights, there is growing recognition of the rights of nature and the importance of protecting the environment for current and future generations. This includes the right of ecosystems, animals, and natural resources to exist and flourish.

Interconnectedness and Interdependence:

Recognizing the interconnectedness of all life forms and the interdependence of human societies and the natural world, many argue that everyone and everything has a right to coexist and thrive together.
Ultimately, the question of who has the right to exist in the present raises fundamental ethical and philosophical issues about the nature of existence, the value of life, and our responsibilities towards each other and the planet. It underscores the importance of promoting equality, justice, and sustainability to ensure that everyone has the opportunity to live with dignity and respect.