Macbeth questions: what is ironic about Macduff replying to Ross's question "Those that question hath slain."

Question

Macbeth questions: what is ironic about Macduff replying to Ross's question "Those that question hath slain."

Answer 1

from what i remember about macbeth, those who question authority figures or rebel are responsible for people dying, because when there is rebellion there is violence. the next logical step is that someone is going to die. at least, this is the way, i interrupt this statement.

Answer 2

In that case, a paraphrased/analogous quote might be the Pen is mightier than the sword, or Loose lips sink ships, and relates to THE Tongue and what words may be spoken, can as easily kill as any dagger