Depends on the incident. 
You can apply it to people doing nothing in a serious situation, and I highly doubt people would come forward if this effect were enacted. The way it works is we become so desensitized to such actions we don't feel it is important to do anything about it or report it.
        
             
        
        
        
 Answer:
B suppressed the issue of slavery and abolition at the the time
Explanation:
 
        
             
        
        
        
Yes Fredric Douglas's account is a trustworthy source for knowing about John Brown's intentions.
<h3>Who was Fredrick Douglas?</h3>
This man was an abolitionist, a speaker and a publisher in the United States. 
He led the march to end slavery during the civil war in the country and before it. 
His account is trustworthy due to the fact that he had personal relations with John Brown.
Read more on Fredrick Douglas here: brainly.com/question/13896424