We may argue about WHICH attackers were on the minds of the Founders.

But SURE AS HELL the militia (a -group- of armed militants who quite honestly would take much more than a minute to organize) was not intended to primarily: protect people from assaults on the street or in their homes, or to protect against home invasion by criminals (although attacks by national opponents, well, maybe), or to stop Political Activists from attacking homes of Gov't officials, or to protect against Gangs that are trying to take control of local government to promote their franchise in the drug trade, etc.