Jesus is merciful and He respects the Law.  These are not mutually exclusive.  It is a false dichotomy to separate charity from justice.

Sometimes we are tricked into thinking that a just solution must lack charity to matter.  Likewise, love that is not rooted in justice is false charity.

O Jesus, in You Charity and Justice are perfected.   May Your Spirit inspire mine, so that I may be fair and loving with others and with myself.