Sadly, it seems that we are unprepared to fight the war being waged. Our enemy places zero value on life, so they will perform acts of violence we are unwilling to reciprocate. We cannot prevail here until we are prepared to take the battle to them (and their state sponsors) on their terms. We need to make them understand that being at "war" with us is a very bad thing with grave consequences. As long as we try to fight a "civilized war", we will continue to suffer. I strongly believe that were we to explain to them in a gut wrenchingly violent manner that their behavior is unacceptable, they would lose the willpower to fight us. If not, they would lose the materiel and logistical support needed to continue their "war" as we explain the situation in a similar manner to their state sponsors. We also need to be willing to stand up and face the criticism of our "allies" when we take the action needed to bring this to a close.
We need to lead, not try to be part of a polite consensus.