I find your disposition very sad Icterus.
You have a "push through the crowd, it's me everyone, listen to what I have to say!"manner.
This series of apparitions has Bishop's approval and has spiritual fruits that are rich and profuse. Marie Julie Jahenney bore the stigmata of Christ to an unprecedented degree. Her authenticity is commonly accepted among Traditional Catholics.
Thus, the revelations must be approached with reverence and gratitude.
Thus you are cautioned:
Matthew 12:36
"But I say unto you, that every idle word that men shall speak, they shall render an account for it in the day of judgment."
In answer to some of your questions, we ought not to seek martyrdom as an end in itself, but after the example of Christ, God's will alone:
Mark 14:36
"And he saith: Abba, Father, all things are possible to thee: remove this chalice from me; but not what I will, but what thou wilt."
Gratefully receiving such heavenly instruction, we are bound to act upon it. The reason for remaining inside (apart from the obvious practical reason) is that the 3 days of darkness is a time of God's wrath on the earth and we are forbidden to observe it:
Genesis 19:26
"And his wife looking behind her, was turned into a statue of salt."
The knowledge that a person found outside will die but be counted as a martyr, is surely a comfort to family and friends of such persons.
God bless.