All asics cause big coin investors know what the hell is going on too and they know they will buy cheap eth and other altcoins, so they sell what they have and then buy back cheaper and then start filling their bags again for the next run, as they know there are asics for eth, now they are investigating the bottom, checking the desperate or idiots who will sell their eth, zec cheap and then will pump these coins 10 times next time. This is pure manipulation but they are only doing it cause they know they can cause asics gave them a reason too. If were not for asics then eth and other altcoins would not have crashed, even bitcoin would not crashed. Probably eth would have been around $3000, bitcoin close to $27k and zec $1200. It happened the same with bitcoin, as soon as asics started mining bitcoin, bitcoin crashed 15 times and then stood at 9 times.
Noobs will say bitcoin crashed because of mt.gox because they dont want to tell the truth. Bitcoin crashed with asics because it was easy money, so it was a run to sell or lose profit cause it was very easy to mine and earn bitcoins.
And most of people ignore this fact
Bitcoin started to be mined with asics on 2013, bitcoin value were at 40$ on march 2013, bitcoin went to 20k on december 2017, a 500x value, so if you say that asics makes a coin value to drop, you can see what happened with bitcoin and see that for bitcoin it was not true that asics were something bad, maybe for gpu miners on 2013 asics were bad news, but not for new asics miners who started a business and not for bitmain, and not for the bitcoin value.