The United States has such a large GDP because 1/3 of it is the private healthcare industry. Another massive chunk is the government throwing tax dollars at a shell company of a shell company of a shell company that moves a government contract for construction around to each other 4 times, all subsequently increasing GDP.
It's clearly not, however it's indicative of the vast wastefulness of the US Gov't in it's pursuit of global domination. In addition, simply referring to Gaza as a warzone would imply this pier would be under any danger whatsoever, which I find doubtful considering the normal tactics of Hamas, PFLP, etc