Why does ross not believe malcolm and donalbain were responsible for duncan's murder?

Ross did not believe that Malcolm and Donalbain were responsible for the death of Duncan because of his belief that the two are not responsible as they wouldn’t have the motive of doing or killing Duncan because it is not in their nature to do that.

abraham lincoln  (february 12, 1809  – april 15, 1865) was an american statesman, politician, and lawyer who served as the 16th  president of the united states  from 1861 until  his assassination  in april 1865. lincoln led the nation through the  american civil war, its bloodiest war and its greatest moral, constitutional, and political crisis.[2][3]  he preserved the  union,  abolished slavery, strengthened the  federal government, and modernized  the u.s. economy.

i believe it would be capitalism