The big thing everyone is missing here is the ruling says the president cannot be prosecuted for actions that are constitutional. So this does not mean the end of democracy or whatever people are saying. The president can’t stay in office after his term expires. The president cannot order his political opponents killed- in fact, the Supreme Court issued a statement on that just this year.

https://www.supremecourt.gov/DocketPDF/23/23-939/303384/20240319133828340_AFPI Amici Brief 3.19.24.pdf

Did you read the article? The scope of this ruling is pretty narrow.