You're quite right, Katarina, but invective in debates is nothing new among Christians. Your "husband" (Martin Luther) had a pretty strong line in invective!
I rejoice in the life of Martin Luther. But scripture convinces me that he was wrong on many issues: Infant baptism, the cult of Mary, and the Eucharist.
I wouldn't call Luther's words invective. Some are down right mean spirited and disgustingly crass. Nevertheless, he knew that salvation was not for sale.
Christians need to conduct themselves in accordance with scripture.
Ephesians 4:29King James Version (KJV)
29 Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.
Colossians 4:5-6English Standard Version (ESV)
5 Walk in wisdom toward outsiders, making the best use of the time. 6 Let your speech always be gracious, seasoned with salt, so that you may know how you ought to answer each person.
God Bless