проверьте

[question]

....стремиться уничтожить то, что угрожает уничтожать его самого...
to destroy that what threatens to destroy it??? по-моему очень коряво

[Krio]

maybe

...to destroy the very thing that threatens to destroy it(?)self

[donkey_hot]

imo:

destroy/eliminate anything posing a threat of destruction [to/for it] / any source of [its] potential destruction / anything with a potential for its destruction;

destroy/eliminate a source of threat to its/his/her [very] existence,
etc.