Balderash. (Good word, my grandpa used to use it).
Trump's speech was full of lies and hate.
Trump's incendiary Mount Rushmore speech criticized for 'peddling fiction'
President made remark in Fourth of July message at White House as coronavirus deaths near 130,000
www.theguardian.com
President Trump Pushes Racial Division, Flouts Coronavirus Rules at Mt. Rushmore Speech
The speech and fireworks at Mount Rushmore came against the backdrop of a pandemic that has killed over 125,000 Americans
time.com
At Mount Rushmore, Trump exploits social divisions, warns of ‘left-wing cultural revolution’ in dark speech ahead of Independence Day
Etc.
I know you won't agree with those assessments but the existence of such headlines across major publications makes it impossible to argue the speech wasn't divisive.