We should stop praising and erecting monuments or memorializations to murderers and slaveowners and teach and accept how this nation was founded by them, not pretend like this is a nuanced issue.
But it IS a nuanced issue. The founding fathers on one hand founded the nation ad a democratic republic with a government obligated to respect the rights of the people in an era when totalitarian monarchy was the norm. They also killed natives and kept slaves. That does not mean the good things they did do not deserve to be memorialized.
I think it's a little telling when people think slavery, imperial conquest, genocide, etc., which are features of a society designed by people who are avowedly in favor of Democracy, does not create a contradiction. You can either acknowledge the contradiction and resolve one end of it, or the word itself is incoherent.