Proverbs 16:29-30 “A violent person entices his neighbor, and then leads him down a path that is terrible. The one who winks his eyes devises perverse things, and one who compresses his lips has accomplished evil.”
Violence doesn’t just have to refer to the physical. Violence comes from anger and hatred in the heart, which can reveal itself in multiple ways. A violent person can encourage someone else to be dissatisfied and angry, which can lead them down a dark path that is ultimately self destructive.
Proverbs 22:24-25 “Do not make friends with an angry person, and do not associate with a wrathful person, lest you learn his ways and entangle yourself in a snare.”
Verse 30 could be interpreted in different ways. Winking could also be squinting the eyes. Squinting the eyes and compressing the lips could be signs of deep thinking, perhaps to commit evil deeds. However, it seems more likely that these are non verbal clues that show when people are conspiring with one another. Either way, the warning is to steer clear of those who plot evil.