C. F. Keil and Franz Delitzsch on Proverbs 28:4

Pro 28:4 4 They who forsake the law praise the godless;    But they who keep the law become angry with them, viz. the godless, for רשׁע is to be thought of collectively, as at Pro 28:1. They who praise the godless turn away from the revealed word of God (Psa 73:11-15); those, on the contrary, who are true to God’s word (Pro 28:18) are aroused against them (vid., regarding גרה, Pro 15:18), they are deeply moved by their conduct, they cannot remain silent and let their wickedness go unpunished; התגּרה is zeal (excitement) always expressing itself, passing over into actions (syn. התעורר, Job 17:8).