YOU SAID:

It was inevitable for them to kill

INTO JAPANESE

彼らが殺るのは避けられなかった

BACK INTO ENGLISH

It was inevitable that they would kill.

INTO JAPANESE

彼らが会うことは避けられなかった。

BACK INTO ENGLISH

It was inevitable that they would meet.

INTO JAPANESE

彼らが会うことは避けられなかった。

BACK INTO ENGLISH

It was inevitable that they would meet.