You are absolutley right!People will be banded together for protection against thieves and murderers.
Tactics like the ones prescribed by Melvin will not be suited to shtf. Just what will become of his wife when he's out crawling around on the ground?
There are many more decent, civilized people in the world then there are selfish fanatics. The human spirit will prevail and the 'true parasites' will be eliminated.
The plan will be to rebuild, not skulk around being a troll.