Darn near every school in America has a security fence around it because 13 people got killed at Columbine 10 years ago.
By comparison, a security fence around a place where more than 2,000 people were killed in one year does not seem terribly out of line.
We could start with...
India (one wall to keep out Bangladeshis and another to keep out jihadists from Pakistan)
EU (to keep out illegals from E. Europe)
Great Wall of China (isn't it time that old thing came down?)
Saudi Arabia (to keep out Yemenis)
Fence between North and South Korea
Fence at U.S./Mexico border (that's working really well)
And many more...