Is omitting "would" in this sentence right?

[Linh Bui Hoang]

Below is my friend's sentence. He took it as an example for me in an argument.
All the passengers in the Titanic ship never forget the disaster if they ever survived.
He explained: this is real in the past (anyone who survived now never forget), so we must omit "would" in this conditional sentence
However, I think it must be "would never forget" because, anyway, all the passengers in the Titanic died, including survivors of that disaster. The disaster happened in 1912 and it is normal to think that survivors now all died simple because of old age.
Would you kindly tell me your opinion?

[Linh Bui Hoang]

Ah, by the way, please turn back to my previous thread "Should it be "all passengers" or "all the passengers" in this". Another problem related to this has emerged and I need your help

[Yankee]

[Linh Bui Hoang]

Yes, thank you. It really helps