Let's take it one step backward out of the fallacy land. Privacy is not murder. Scammers would get away without mixers just fine (using XMR for example) and not having mixers would limit the choices for legal uses while doing nothing to stop the scams.
I will avoid stretching it but it almost sounds like people are going to scam anyway so let's make some money by supporting them, doesn't it?
Robbers are going to get out on bail so why bother complaining and getting them arrested, instead let's take some money and let them go. Is that how you mean? By the way, I am more than happy to discuss it on PM if you have time and patience.
If scammers use Monero and get away then we have to look towards it, but that does not mean we should start supporting scammers because they will eventually find a way.