Obviously, if this military adventure were in fact necessary to maintain security or to preserve freedom, as its advocates and promoters proclaim--and if it were to prove as successful as its boosters hope--then the cost might still be worth it.
Obviamente, si esta aventura militar fuera de hecho necesaria para mantener la seguridad o preservar la libertad, como proclaman sus partidarios y promotores (y si terminara siendo tan exitosa como esperan sus impulsores), el costo podría valer la pena.