No, ICBMs, ballistic missiles, and cruise missiles are not just "demoralization" devices. They're highly effective, if expensive, ways to take out critical assets that you need to win wars.
Long range drones as well. Russia is sending waves of hundreds of propeller (and increasingly jet) powered drones that each can deliver an ~50kg explosive payload. If not for anti-air defenses, each one of those drones could result in important infrastructure being taken out.
Leave war up to the experts who are actually fighting it. You don't have a clue how this actually works in reality.