The family, did they all deserve punishment?
The set up of the film suggested a lot of tensions and family feuds going on, and people generally treated each other terribly, except for Omi and perhaps Max's dad. You could say that in their way, they each deserved Krampus' punishment for ill will:
The aunt, uncle, and cousins were rude, inconsiderate, and downright cruel on occasion.
Max's mom had some mean things to say about her aunt, and that snide remark about her sister's family surviving on hot dogs and macaroni.
Max himself had his blow up at dinner time, fighting his cousin and then tearing up his santa letter, wishing they would all go away.
Maybe I just missed it, but I don't see however that Omi, the baby, or Max's dad had any noticeable ill will. Isn't ill will the requirement for Krampus to come and take people?
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"I'm sorry, but.." is a self-contained lie.