Exactly what was going on in my mind. If this attack is executed, it gives a negative feedback to not only users of crypto but to everyone across the world. The reason many person dive into Bitcoin investment and not all altcoins is because of the security and reputation of Bitcoin, if that is broken then, no altcoin would be trusted anymore and that might mark the beginning of the downfall of cryptocurrency.
People don't "trust" altcoins and they don't care about their security at all. Most people you call "investors" don't even own altcoins they just buy them on an exchange and keep it there to dump and make a profit. That is all they care about, the money they can earn from the altcoin pump and dumps.
I have seen it with my own eyes back in 2017 with altcoins that were dead (they had no blockchain anymore and no new blocks had been mined for months) but got pumped and people bought them to make profit.