All premises, even if they are accepted as truthful, should still be challenged on a regular basis. Just because a truth may be valid for one instance does not mean that it always will be.
Here is an excerpt from On Liberty by John Stuart Mills:
1. If an opinion contains truth and the opinion is silenced, the truth is lost.
2. Even if there is only a particle of truth in a wrong opinion, the truth is still lost if the opinion is silenced.
3. Even if a popular accepted opinion is the truth, people will hold onto that truth as a mere prejudice unless that are forced to articulate a defence to it.
4. Even broadly held opinions lose there currency and impact unless it they are challenged from time to time.
There can be no harm in challenging an accepted truth.
There can be no harm in challenging an accepted truth.