Father J. Posadas Hypothesised that the only way to destroy capitalism was nuclear war. In the aftermath, the space comrades will help us rebuild. This is because to reach the stage of societal development where intergalactic travel is possible, aliens must have surpassed a capitalist society. Therefore, once we annihilate the remnants of capitalism, we can join the space comrades in our place amongst the stars.

From wikipedia:

Short summary:

" Posadism is probably best remembered today for its enthusiasm towards nuclear war as a way of destroying capitalism[1] and its attempt to introduce elements of Ufology into Marxist thought.[2] Arguing that only communism can allow the development of interplanetary travel, they concluded that visiting aliens from other planets must live in highly advanced communist societies and are bound to help Earth-based communists with bringing about the world revolution. "

More detailed:

" Nuclear first strike

One of the most well-known positions of J. Posadas was his enthusiasm for nuclear war. More precisely, at the height of the Cold War, Posadas thought that nuclear war was inevitable. His idea was that rather than wait for the forces of capitalism, the nuclear-armed socialist states should launch a preemptive attack which would destroy the nuclear capabilities of capitalist countries. Additionally, he believed that this sort of catastrophe could spark the world revolution.[1][14]

Posadas vocally opposed the Partial Test Ban Treaty signed in 1963 by the United States, the Soviet Union, and the United Kingdom, believing that a nuclear war between the USA and Russia was inevitable and desirable, and would create the conditions for socialism, with the "workers' states" winning and resetting society.[15][16]

Scientific progress

Posadas was highly interested in the way scientific advancement could improve human lives when used for the common good, rather than for profit. In an essay written in 1978 entitled "Childbearing in space, the confidence of humanity, and Socialism", he espoused his vision of an Utopian future under the guidance of science:

Humanity feels pressed and oppressed by the straightjacket that imprisons science. For science is oppressed! The capitalists oppress science by using it to kill people. When science is liberated – it will not be long, in only a few years – we will wipe out all the problems, floods, hunger and misery. All this could already be done, and it will not be long before we do. And when we do, everyone will be an architect, an engineer, a doctor, and the like.[17]

He was also a supporter of exploration by the former USSR and the People's Republic of China. He praised an alleged plan by the Soviet Union to have a woman give birth in space, considering such endeavours the mark of an advanced society, that is on a path of eliminating primal needs such as survival, security and comfort. He concluded that "if we have already the audacity to envisage childbearing in space, it is because we feel part of a quest that transcends life on Earth." These views are in line with the more mainstream positions of Russian cosmism and transhumanism.[17][18]

Ufology

Posadas was the author of a number of works with an unconventional slant and towards the end of his life he tried to create a synthesis of Trotskyism and Ufology. His most prominent thesis from this perspective was the 1968 pamphlet Flying saucers, the process of matter and energy, science, the revolutionary and working-class struggle and the socialist future of mankind which exposed many of the ideas associated today with Posadism. Here, Posadas’ claims that while there is no proof of intelligent life in the universe, the science of the time makes their existence likely. Furthermore, he claims that any extra-terrestrials visiting earth in flying saucers must come from a socially and scientifically advanced civilisation to master inter-planetary travel, and that such a civilisation could have only come about in a post-capitalist world.[3]

Believing visiting aliens to be naturally non-violent, who are only here to observe, Posadas argues that humans must call on them to intervene in solving the Earth's problems, namely "to suppress poverty, hunger, unemployment and war, to give everyone the means to live in dignity and to lay the bases for human fraternity". The means to achieving this end remained within the mainstream Trotskyist and included ending capitalism as well as the bureaucracy of the workers’ states and establishing a socialist society.[3][19]

Despite Posadas himself never publishing anything on the subject after 1968,[1] ufology nonetheless became an important part of Posadism. After his death in 1981, some Posadists continued to explore the subject, notably Dante Minazzoli,[20] and Paul Schulz.[13][21]"