Yes it is. It is part of what we are called to do. It is part of love. Love is not a feeling, love is an action of mercy. The works of mercy are: to feed the hungry, to give drink to the thirsty, to clothe the naked, to visit the imprisoned, to shelter the homeless, to visit the sick, to bury the dead, to admonish the sinner, to instruct the ignorant, to counsel the doubtful, to comfort the sorrowful, to bear wrongs patiently, to forgive all injuries, to pray for the living and the dead. Our love is to admonish the sinner, even ourselves, to instruct the ignorant, and to counsel the doubtful. Apologetics is love in action.