Why are suppliers that only accept payment via Western Union allowed to conduct business on Alibaba?

As much as Western Union charges a customer to send money somewhere, you would think that would provide greater consumer protection through Western Union as payment method for Internet commerce . After recently being scammed twice by the same individual, for a total of $ 1,000 , I learned of the many reasons for not using this as a payment method the hard way . There must be a method of payment available to customers who are afraid to send money to a company they had never done business with before it is safer and offers more protection for someone like me who was recently shopping first international . Alibaba warns consumers to be warned against doing business with a company that only accepts payment through Western Union .... however, Alibaba is the same reason that are capable of carrying out their fraudulent in the first place. Certainly , it gives me mixed signals about this site and any future transactions that take place here.