Question

what were some reasons renaissance humanist writers gave for writing in the vernacular

Answer 1

They did this so that not only the aristocrats would revel in works like religious books, but also the commoners. This would imply that art and intellect must be universal. Even those not educated in the Latin language will understand.

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Answer 2

The correct answer to this open question is the following.

In the Middle Ages, just the aristocracy and the clergy knew how to read and write. They were the only ones who could access education.

But during the Renaissance, more people could access to basic education. So writers of this time though that Vernacular was the common language spoken by many people so a good way to spread their work was to write in vernacular so many people could read it.