I was interested in the following sentence which appeared in an article titled “In Rossellini’s War Movies, the Naturalism Survives" by Dave Kehr in The New York Times (January 22, 2010).
It’s almost impossible to underestimate the importance of these movies, both for the impact that their startling realism had on the audiences and filmmakers of the time and for the influence they continue to exert on directors.
Can someone clarify if the fragment "almost impossible to underestimate" makes the sentence illogical?
I would reword "underestimate" with "overestimate", but I'm not quite sure on this correction because I'm not able to precisely identify the meaning of "underestimate" in this context, and the word "almost" that precede "impossible" makes the problem entirely incomprehensible (to me).
(Apologize in advanced if the question is not good for this site or if it is a dupe of another question. If so, please delete rather than close. Thank you.)