come hanno potuto

how could they

→ come
phrase Rare #40,456
how could they Used to express disbelief, shock, or indignation about something they did or failed to do. It is often followed by an infinitive, such as “Come hanno potuto farlo?” (“How could they do it?”).
IT: Come hanno potuto lasciarti da solo?
EN: How could they leave you alone?

Come hanno potuto?

How could they?

— Loveless (2017)

Come hanno potuto pensare di abbandonarti, eh?

How could they even think of abandoning you, eh?

— Le buone stelle - Broker (2022)

Ma come hanno potuto farlo?

But how could they do it?

— Oppenheimer (2023)

Come hanno potuto farmi questo?

How could they do this to me?

— Lui è tornato (2015)