Why even try to strike a deal with unreasonable, unserious people who don't respect their own signed agreements?

Absolutely. Almost everything about this administration screams "deeply unserious". And throwing away previous agreements (that Trump made)... yeah, what's my incentive to strike a new deal? They can expect Trump to throw that one away too.

It's better to just rag the puck and wait for them to be gone.

Um... could you translate that for me?