I don't think so, Rise and fall of coins is based on supply and demand, but if it goes down it's not possible because it depends on the platform used, for example:
ETH Platform : all coins that depend on the ETH platform fall if Ethereum Price Down.
As for bitcoin not necessarily fall following ETH, because it stands alone.

Altcoins is going with two biggest cryptocurrencies (Bitcoin and Ethereum). I think that all other altcoins it is just noise and price connected with price of this two monsters of cryptoworld.

I think all the coins fell due to media coverage of Bitcoin and Altcoin falling.
Why does it affect?
We'll see, the news can affect many people's minds as coin owners to sell their coins right away to avoid losses.
Many people do panic selling.
So the price of Crypto continues to decline one cause is the media coverage.

Not all altcoins are down because what I see now is that altcoin prices have increased and especially with the rising altcoin prices probably from a large number of people buying altcoins and that is very helpful for the current price increase, as I see day by day altcoin prices are rising

All coin is dropping because of dropping  bitcoin price. Altcoin price up & down it depends on bitcoin stability. When bitcoin price is pumping or dumping both time all coin price is dropping.

The South Korean Minister of Justice stated that the South Korean Ministry of Justice is preparing to draft a bill to prohibit transactions through certain cryptocurrency exchanges. Other officials of the South Korean government subsequently issued statements that were slightly more Microsoft (90.14, 1.79, 2.03%). Reuters reported that the People's Bank of China has urged the authorities to ban the centralized trading of virtual currencies.

Most likely, because altcoins are depending on the value of bitcoin though it is part of cryptocurrency but bitcoin is a dominant cryptocurrency with high value. So, while the bitcoin is going down its value, definitely the other coins will drop down.

The market for cryptocurrencies is currently vulnerable to a variety of unfavorable news. People are always sensitive to news that they do not know where to hear.

The market is driven by news and the movement behind these news is bitter. Yes, now there are more than 1500 crypto-currencies on the market, but all of them depend on the price of bitcoin. Hence, such indicators, if bitcoin is corrected, all tokens are corrected. Of course, if all the exchanges set currency pairs to the dollar, then with a high degree of probability, the market will behave quite differently, but it is not profitable for exchanges, therefore only the top coin is traded to the dollar. While all the tokens will be traded to bitcoin, nothing will change and the price of altcoins will depend on the price of bitcoin and its movement relative to the news background.