MS-13 members are pawns in a larger political agenda of open borders and destruction of American culture. MS-13 and other invading ideologies grow the Central government larger and create chaos. Chaos brings change. This is one way to get around the Constitution of limited government.
IMO, this is one of the reasons Congress is doing very little to curb the illegal alien invasion from the southern border. Some members of Congress will gain a lot of money for their next election helping to destroy American culture.