Eh I mean some of them are though. Manchin and Sinema get the biggest hate, but there are others who agree with him who are just not as obvious or loud about it.
I mean abortion rights which were settled for 50 years just got completely destroyed, and if the entire Democratic party actually cared about this issue, they'd enshrine it as a right in law with 51 votes, but they won't because a handful secretly agree that abortion should be illegal.