Final answer:
Dallas is driven out of town by the "Law and Order League" because they saw him as a threat to the social order they aimed to enforce, which historically involved targeting behaviors or individuals viewed as disruptive or immoral.
Step-by-step explanation:
The reason Dallas is driven out of town by members of the "Law and Order League" can be understood within the context of societal efforts to maintain law and order. Groups like the "Law and Order League" often arose during periods of social unrest or perceived immorality, aiming to crack down on individuals and behaviors seen as threats to the social order. In historical instances, such efforts have led to the targeting and victimization of certain groups under the guise of keeping the peace, as was the case with events like the Chicago riots and the actions of the White League as well as the systemic harassment of individuals in scenarios involving the Zoot Suit riots and vice districts. The enforcement of certain laws and social norms could become quite aggressive, leading to the expulsion of individuals like Dallas whose presence or actions were deemed unacceptable by these enforcing parties.