By law, if a company does not protect it's trademarks when a potential infringement occurs, they lose the trademark. Hasbro is acting to protect it's trademark, no matter what the outcome is, if there is even a chance of infringement, they must challenge it to defend the trademark they already hold. If they don't challenge this, it could lead to cases against future infringements being thrown out because they did not defend their trademark this time. Trademark law is specific and harsh, and requires companies to actively pursue legal action to protect their trademarks. Their endgame likely to retain their trademark for the future no matter what the outcome of this particular case is.
-M