The worst part of a scam coin is that it eventually hurts every coin and every person invested in cryptocurrency. Because while they steal the money of those foolish enough to invest in their scam, they also tarnish cryptos in general and scare new investors away from the whole market.
Yes, it makes it easier for those opposed to crypto to point and say "see that, can't be trusted, it's all a scam" scaring away companies who might be interested in using the tech.