The anger at the boycott is not the exclusion from government. Had Labour won, it would have been in the course of events for them to be on the outside.
The chutzpah is on the Likud – Rightist government (albeit Likud tried). Chareidim gave Likud the majority in ’77 and ’81, saved Shamir in ’90 even though Peres offered them the better financial deal, and gave Netanyahu his majority in ’96 and ’09.