While I tend to agree with the tenor of these thoughts I disagree on specifics...
Fallen refers to the free will decision of someone to rebel against GOD's plans or even against HIMself as our LORD GOD.
I find the answer to why the judgement upon the demonic reprobate was postponed in favor of a prison planet for sinners as per Rev 12:4-9, in Matt 13:27-30 in which GOD tells the angels to postpone the destruction of the demonic reprobate, the weeds, so as to let them live together with the sinful but good seed (the fallen elect) until the harvest.
Iow,
GOD has chosen to delay the judgment day because, as HE wrote in the parable of the weeds, some of HIS sheep, HIS elect, have gone astray into sin and to call the judgment upon all evil ones would condemn them also against HIS election promise to them of salvation.
The parable tells us that we must live with the reprobate weeds. In other words, their influence upon us is good for our sanctification or HE could send them to Venus or Mars to wait for the judgment day with no need to afflict HIS people with their leaven and predacious evil.
The time of the harvest is the time of the maturity of the wheat and the only maturity that can save anyone from the judgment is a maturity in holiness, a perfect redemption and a full sanctification. Once these sinful elect, (ie, the last sinful elect) comes to a full repentance unto holiness in his heart, the elect sheep will be separated from the reprobate goats and the judgement will follow.
So it is the sins of the elect which forced the plan for earth as the prison of all sinners with a rehab centre in it for the fallen elect, HIS sheep gone astray into sin, as their best possible life to learn to come out from among the reprobate and to touch not their evil, ie, to become holy, the continuous call for HIS people as repeated in 2 Cor 6:17 Berean Standard Bible “Therefore come out from among them and be separate, says the Lord. Touch no unclean thing, and I will receive you.” Deuteronomy 7:2-6 Numbers 16:21,26,45 Isaiah 52:11 Ezra 6:21
GOD's plan as expressed by our creation was to have a loving marriage relationship with HIS creation, ie, with those created in HIS image as able to become a perfect Bride for HIM. Some rejected that plan, becoming the unforgivable demonic reprobate . Earth is only the contingency plan to deal with the elect who went astray into sin by refusing to accept the damnation of the reprobate as an absolute necessity...
Earth and our earthly lives are not to deal with Satan (only the judgement will do that) but to deal with the sinfulness of HIS sheep gone astray into sin, the sinful people of HIS kingdom, HIS sinful elect, to fulfill HIS plan for them to become HIS perfect Bride.
