At least in the first movie, the motivation was to start global nuclear war. (fatmovieguy.com)
If it so happens that ten or twenty or fifty years from now all nuclear weapons have been abolished, a few of the persons who grow up in that post-nuclear era may read this essay at some point in their lives and glean from it a feeling for what it was like to live under the threat of global nuclear war. (religion-online.org)
Often imitated but never equalled, Metal Gear is a pixelated treatise on betrayal, genetics, politics, philosophy and the omnipresent threat of global nuclear war. (playstationlifestyle.net)