what are the pros and cons of loose constructionism, and the pros and cons of Originalism

Explanation:

Originalism prevents judges from gaining unfettered discretion to inject their personal values into a written constitution.

Originalism helps ensure predictability and protects against arbitrary changes in the interpreted meaning of a constitution; to reject originalism inplicitly repudiates stare decisis.

If the Constitution as interpreted can truly be changed at the decree of a judge, then "The Constitution ... is a mere thing of wax in the hands of the judiciary which they may twist and shape into any form they please."