Yossi,
1. How does Ramban say that when he holds that conquering EY is a mitzva in every generation? As for the other sources you cited, I wil have to see exactly what they say. In any case, why should we pasken like the Minchat Eliezer against the Avnei Nezer, Rav Meir Simcha, Rav Soloveichik, Rav Kook and others?
2. Here is what the midrash says regarding Bar Kochba:
????? ??? ???? ???? ? ???? ? ?? ???? ?? ?? ?????:
“????? ???? ?????? ?????? ??? ?????? ?? ????? ??? ????? (??? ?????? ??????? – ?? ????? ??? ?????) ??? ??? ????? (????? ?’)
??? ??? ????? ?????? ??? ??? ????? ?????????” ??? ??? ???? ?? ??????? ??? ???? ???? ??????? ???? ?????????? ?????? ????? ??? ??? ?????. ??? ?? ?”? ????? ??. (???? ????)
??? ???? ????? ???? ???????? ???? ????? ???? ?? ??? ????? ?????? ???? ???? ???????? ???? ??? ???? ????? ????? ???”? ?? ??? ???? ???? ?????? ??? (???????) ???? ????? (?????). ??? ?? ????? ????? ???? ?? ????? ?? ????? ???? ???????? ?????? ?????? ??? ?? ???? ?? ??? ???? ?? ???? ???? ?? ????????. ???? ??? ??? ???? ??? ?????? ??????? ??????? ??”? ???? ???? ????? ??? ????? ???? ??????? ??’ ????? ?????? ????? ?????? ??? ?????? ????? ?’ ????? ??? ?????? ?????? ?? ???????? ??? ?????? ????? ????? ?”? ??? ???? ??? ?”? ??? ??? ??? ?? ???? ???? ??? ????? ???? ???? ??? ??? ??? ?? ?? ???? ??? ????? ???? ??? ???? ??????? ???? ???? ?????? ??? ??????? ???????? ??????? ?? ?????? ??? ?????? ???? ?????? ?????? ???? ???? ?’ ????? ?????? ??? ??????? ?”? ?? ??? ?? ???? ????? ?”? ??? ??? ??? ?? ???? ?? ??????? ??? ???? ??? ???? ???? ?????? ?????? ???? ??? ??? ?? ??? ??? ????? ?????? ??? ?????? ??? ??? ?? ????? ?????? ?????? ????? ?? ??? ????? (????? ?”?) ??? ???? ????? ????? ???? ??? ?? ????? ??? ??? ????? ???? ?? ??? ????? ????? ?? ????? ?????? ??? ????? ????? ????? ?? ???? ???? ??? ???? ???? ????? ??? ???? ??? ???? ????? ?????? ???? ????? ?? ??????.
He was arrogant and wanted to go it alone without Hashem.However, Rabbi Akiva supported him so apparently he wasn’t concerned about the oaths.
3. The persecution in Teiman was only a local persecution.
Patur, as I posted, we do not hold that theSatan acts as Gd’s opponent. That is another religion. The Satan is a shaliach of Hashem. Maybe his job was to incite the Arabs so that we would get more land.