In essence, Accosta's question was legit, and that's a question most people would like to be answered regarding their own government.
The problem is, Accosta represents a clearly biased media outlet, not hiding his partisanship, and his question was very loaded: he is potentially asking Trump to admit the current situation is his fault.
And as to "the people who are upset with you"? Well, there are people who are upset Trump even exists.