tell him this.
animals have morals, too.
the morals we have are developed to ensure our own survival.
we don't think twice about pesticides on our crops because they let us eat. even though they kill live. lots of life. we don't think twice about killing animals for food. we don't think twice about killing things that threaten us. we spare the things we see as needing assistance. because they are not a threat. that alone brings our compassion.
ask your friend to find you statistics on how many pastors have been unfaithful to their wives or have been divorced. our sexual mores mean nothing.