The House Dems who voted against the BIF did so because Manchin/Sinema keep going back on the agreement to pass the entire package, despite progressives constantly being expected to compromise and give in while conservadems never do. Their vote DID NOT keep it from passing, had that been the case I expect Pelosi would not have let them vote against it.
Manchin/Sinema on the other hand, ARE keeping the BBB from passing. Unlike everyone else, they move goalposts and in Sinema's case refuse to clearly state what she wants. Although, their weaseling and changing do make it clear what they're working for, and it's not Biden or us.
Progressives, from The Squad to Sanders, have worked their asses off supporting Biden and the total BBB package. Manchin/Sinema are working against Biden, and frankly AGAINST Democratic values.
That is why.