rat4 wrote you that for those atacks BC POS is not valuable how many times he need wrote the same ?
Writing that you don't think attack vectors exist does not mean that attack vectors do not actually exist. Replies of "that will not happen" are denials of the rich conceptual history and well noted theoretical problems of proof-of-stake systems.
I visited your links. You do realize no system is 100% secure? If it was created by man it can be defeated by man. I would like to point out the 51% attack with a POS coin in theory IS possible but would be very expensive and would make most of the people here very wealthy. That is similar to me suggesting that if someone took a tank and rolled it into my local bank they could take all of the money out of the vault. Yes it can be done, but the likelihood of someone doing that is virtually impossible.