Can you please read again the wiki article on what the gun's capabilities are and where it's deployed, as I don't think we are talking about the same thing?

First, masses of innocent people don't usually charge at borders of countries with which they are technically at war. Second, this is not a "gun see, gun kill" technology. There are humans involved and I'm pretty sure the level of automation is directly related to the assumed probability of border being attacked. In more peaceful times, it will be almost all manual. In a full fledged war - mostly automated. You can't afford to be sentimental when your country is being invaded.