Democrats

This is ahistorical nonsense. FDR (D) was pro-interventionist, and isolationism was more common among Republicans. Though the 1930s—1940s were overall a less partisan time than today.

https://www.ushistory.org/us/50a.asp

Example: FDR supported Britain against Nazi Germany even before Pearl Harbor through the Lend-Lease Act etc.

https://en.m.wikipedia.org/wiki/Lend-Lease

In the end, Pearl Harbor turned American public opinion decidedly in favor of war.

Yes of course,, We were supposed to set back and let him exterminate all of Europe, right.? Pacifist are always the first to go.

Point is, Nevel Chamberlain and many others tried the appeasment approach.. It didn't work.. Bullies don't back down when one shows submission,, they are only emboldened by displays of weakness.