Calling Chicago’s most violent weekend so far this year “despicable,” police Superintendent Eddie Johnson stuck to the department’s usual explanation for what went wrong, blaming the flow of illegal guns and a too lenient court system. “Unfortunately, over the past 72 hours in Chicago, we saw a despicable level of violence,” Johnson said at a news conference Monday at police headquarters. “Weekends like this remind us all of the challenges that we face and that they are complex and profound.”