This is a horrible answer for a variety of reasons. First off, attacking another PC, as a Lawful Good character, is an out of alignment action. Secondly, you must be the most balanced person in the universe, cause I’ve never seen one of these posts end with people thinking “oh yeah, attacking a party member because you’re different alignments is a GREAT idea!” This stuff leads to hurt feelings and damaged friendships. It almost always escalates into in-fighting, and failure to move the adventure along, which damages the whole group dynamic. A good DM would find a way to resolve the tension through storytelling, but to say a good DM would require an alignment switch over not attacking another party member is just nonsense.