So it means that there is the presence of "dormant" vices during the start of the Golden Age ?
Yes, I believe so,everything is contained in us always.
Take for example a past life, how many can truly remember one, many or any past lifes. I'd say 99.9999999999999% cannot. So if you believe in past lifes and reincarnation, it shows that the knowledge/memories of them are merged within the soul. From that we can deduce that other things can be merged or hidden.
On the flip side all our virtues are already contained within us and it is through(I believe)the teachings of ShivBaba and rememberance, that they once again re-emerge, numberwise , according to effort.
So how does the impurity emerge, once souls have been purified? I believe it is because of:-
a, The soul power weakens, like a battery going flat.
b, Dieties then from a weakened consciousness get influenced by the souls coming from the Copper Age onwards and not having proper true guidance fall into the path of impurity.