a SHTF will not be pretty with the gangs, drug users, all the people on meds, the jails, and on top of all that there will be people killing for food. On top of all of this is the government which may have divided in two or three powers and will be in war with each other.
The plan is what Selco has said many times is avoid trouble and only use force when there is no other choice. If you have a save place with food and water then stay put, do not go out into the streets even to see what is going on. If you do and are spotted they will fallow you back to your save place.