2: impossible to tell with neither pronouns nor their antecedents, a case of YGIAGAM
4: Big difference between "won't say" and "can't say", don't you think? Hard to tell with no context, but it looks like a headline meant to be critical of the the police not for their choice to not enforce some unstated thing but their inability to do do. Not enough information there to say for sure, though. I would guess that there is some figurative use of speech at work there, rather than a straight literal meaning.