I don't think those non-muslims leaders are telling individual muslims to be chilled about this issue.

They are telling those muslim politicians, especially that Akmal, not to over sensationalizing and escalating the issue even though the responsible party already apologized. Because it may cause irrational consequences which happened in the past in other countries, such as Pakistan.

It is all right to be angry because you feel that someone insulted your faith. Let police do the investigation and see what the outcome. If the responsible party is really wrong, charge them in court.