If you claim something that is not generally known, a citation is kind of nice. If you are asked for one, a citation is even nicer - where one asks, ten or a hundred others may have the same question. You want the asker to go Google it, but you might save a hundred people the work.

I've done a cursory search and all I can find is articles on the dangers of EVMs and EVM manipulation; nothing about engineers testifying that they were forced to make them vulnerable. Perhaps there is information on this but it isn't immediately obvious based on a Google search. Additionally, while leaving out a citation where it's due is a common and normal occurrence, actively becoming hostile when asked to provide one is a great way to destroy any sense of credibility.