Did you actually read the article? The entire thing is basically addressing the exact thing you’re saying. I’m not talking about businesses being held legally accountable, I’m talking about them being held accountable by their customers to do their part in protecting the customers/community and to do what is right.
Washington is an at-will employment state, and you can let someone go for whatever reason as long as it’s not based on a protected class, which this would not be.
Relying on conviction in the case of accusations of sexual assault is not going to change anything about the rape culture we live in. If you read the article, I address the fact that convictions are extremely rare in relation to the number of actual assaults that take place.