the only fault you are is not able to control the emotions or can not be patient, if you hold it then you will not lose and definitely profitable, ethereum is the most potent altcoin in my opinion because ethereum platform much in use by the new altcoin
You are right there but the poster doesn't say it is because of emotions. He use an example of the currency he bought and he loss with it. Traders need more knowledge to be able earn and get a better skills. The bottom line is be patient especially if you are holding a top coins.
If we are looking on the current situation of the market for sure there are lots of investors and traders losing up their coin holdings and weak hands for sure are selling out their tokens because of such panic.If you did able to buy on high price and see this red market then you will eventually panic out and might sell if you are a weak holder.Losing out money is always been part of trading career because price is way to unpredictable.