CriticalThought
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This poster is IGNORED!!!
Definitely they can be and its not about cost either, the point is how many can be taken out and in what time? Even if just one out of the hundreds or thousands makes it to the target, objective is achieved.
Just out of interest, I'll try to outline how one may defend against a drone swarm. I have already written this in another thread as well. Here I will expand a bit further.
If the drone swarm has a tight formation, then anti-aircraft fire will decimate it very quickly. A more loose formation can be handled with something like a fuel air bomb, or a thermobaric bomb if collateral damage isn't an issue.
Alternatively, the defending side can unleash its own drone swarm. All they need to do is get close and explode.
Finally, there is always EW/hacking. The drone swarm must get commands from somewhere. Their receivers can be easily jammed. They may rely on GPS signals. GPS can be jammed and/or spoofed. They may rely on IR/Visual sensors. These sensors can be fed wrong signals. Or an EMP pulse type attack can be launched to fry their electronics with microwaves. NOTE that such an EMP pule DOES NOT require a nuclear blast. Modern methods are available to create EMP bursts without nuclear explosions.