A rule applied selectively is often a preference pretending to be principle.

Selective enforcement tells you what a rule is really for. When a standard is invoked against some people and quietly set aside for others, the principle is not doing the work; the preference is, and the rule is providing cover. Everyone involved usually senses this even when nobody says it.

Where you have authority, check whether your rules have been applied evenly over the last few months. If they have not, either enforce them properly or change them. An unevenly applied rule costs more legitimacy than no rule at all.