It's about policing women (and other people they don't like). He needs an armed militia because his intention is for these men to act as his version of Brownshirts, and they will not be policing Black neighborhoods. They will be bullying and terrorizing their white neighbors (and probably just killing any Black or Brown people they see.) If you think you'll be unaffected by what happens after trump is elected YOU ARE WRONG!
Really, how long do you think it will take for the mass atrocities to begin after trump is elected. I'm guessing about 30 seconds!