You're right, it's a bad analogy but people always struggle with trying to analogise things like this that don't have a parallel in the physical world.
If you had the Russian army attempt to blockade shops you would expect a response from the US Army and the shop to be unblockaded in fairly short order.
The dangerous thing about DDOS is not that it's a particularly deadly weapon but that it's powerful enough to do a non-zero amount of economic damage with little/no risk for the perpetrator and that there is no effective counter-measure that doesn't involve throwing money away.
If you had the Russian army attempt to blockade shops you would expect a response from the US Army and the shop to be unblockaded in fairly short order.
The dangerous thing about DDOS is not that it's a particularly deadly weapon but that it's powerful enough to do a non-zero amount of economic damage with little/no risk for the perpetrator and that there is no effective counter-measure that doesn't involve throwing money away.