WASHINGTON — Israel’s war against Hezbollah and Hamas, while inflicting considerable damage, has yet to strike a crippling blow to either of the Iran-backed terror groups, according to a top U.S. counterterrorism official. The acting director of the U.S. National Counterterrorism Center (NCTC) said Tuesday that the impact of Israeli intelligence operations, along with repeated military airstrikes and ground offensives in Lebanon and Gaza, have severely diminished the ability of both groups to launch new attacks on Israel. But he cautioned that both groups remain resilient, and in the case of Hezbollah, retain significant capabilities. “Before the conflict, they [Hezbollah]