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They were intended to help researchers in seeking the truth, or in seeking to reveal untruth.

They were intended to help researchers in seeking the truth or in seeking to reveal untruth.

I would say that in #1 "or in seeking to reveal untruth" is unnecessary and was added at the last minute as some kind of last observation but not in order to precise in the meaning, but rather as something that was added so as to not render the sentence factually incorrect. While #2 "or in seeking to reveal untruth" is crucial and might have been or will be illustrated in the context.
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Hi,
They were intended to help researchers in seeking the truth, or in seeking to reveal untruth.

They were intended to help researchers in seeking the truth or in seeking to reveal untruth.

I would say that in #1 "or in seeking to reveal untruth" is unnecessary and was added at the last minute as some kind of last observation but not in order to precise in the meaning, but rather as something that was added so as to not render the sentence factually incorrect. While #2 "or in seeking to reveal untruth" is crucial and might have been or will be illustrated in the context.

It seems to me that the phrase 'or in seeking to reveal untruth' does not really add anything to either sentence. If you reveal what is true, does than not also imply that you reveal what is not true?

Do you think it might be more accurate to say that researchers try to establish the facts, rather than that they seek the truth?

Best wishes, Clive

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Try this:

A: You went to the amusement park just so you could avoid your in-laws, didn't you?
B: That's not true! I didn't go because my in-laws were in town.

A: Did you go the amusement park?
B: I didn't go, because my in-laws were in town.

In the first, you went, but not for the reason stated.
In the second, you did NOT go, and for the reason stated.
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Comments  
well, actually, this is a bad example, I couldn't think of a better example to illustrate how a comma can affect the meaning of a sentence.
 BarbaraPA's reply was promoted to an answer.
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I just realized something

#1 I don't agree, because he is not smart.

#2 I don't agree because he is not smart.

#1 =/= #2

#3 I agree because he is smart.

#4 I agree, because he is smart.

#3 =/= #4 either

thank you.