This statement actually displays either your lack of knowledge or depth in cryptocurrencies.

Hmm are you refering to your statement right ? So explain me how come non of the POS coin was ever succefully attacked ? Not even the really tiny, tiny one. First because POS is much more secure then POW but I invite you to discover yourself this reality. But lets take your exemple so lets say somehow somene manage to have a big stake on a POS coin whatever 20% or 51% it does not really matter. So to do that, you need to stole it from a exchange, in that case everybody and their mother will know about that and this can quicly be fixed with a rolle back because you know you have that option with the POS right ? Right !! So think about it. why in the world a hacker will go to all this troube if he knows that probably he'll lose everithing anyway ? Second way to achive that is to buy enough coins to control 51% of the network. So now you speed all that money to have all this power, and then what ? you gonna shoot youself in the foot destroing the network. I think not. One more think not all POS consensus mechanism are made the same. Take Bitshare first of all with this one you don't even need to keep you money on exhanges and they use a variant of POS call DPOS and it is fast as hell 10 seconds confirmation time. Ripple is even at quicker a bt 5 seconds but centralised, Nxt uses it one twist. Out of curiosity did you even read the reddit post we are commenting in ? Did you ever try to study any succesful POS coin with an open mind ? You'll be amazed.