Fascists represent an authoritarian and extremely far right wing form of highly nationalistic government, so they would gain power in times of social conflict that would leave people feeling threatened. This would be in: 1.), 2.), & 5.)
I don't think 3.) would apply as this was a huge issue in the Soviet Union, and yet the fascist government remained in power for decades. I also do not think 4.) would apply as growing minority power would limit the power of the potentially fascist "majority."
I think it is the last one
Marines, weary from battling North Vietnamese, rest at the altar of an abandoned Roman Catholic church south of Con Thien in South Vietnam on May 16, 1967 does this help?