Dobra decyzja dla Polski?
On the first concern, the jury is still out; on the second, based on this survey (whose accuracy I can't evaluate), the Polish people consider the cancellation to be a good decision for their country by 48% to 31%, a substantial although far from overwhelming plurality. Whatever the reason for that opinion, it at least implies that the people holding it don't feel betrayed.
I hope this reflects reality. The eastern European states liberated from the Soviet empire in 1989 and 1991 are among the most supportive allies the US has, and are a critical asset in dealing with the only other country on Earth which can legitimately be called a superpower. We need to make sure they never have reason to regret siding with us.