Why should grace and law not be mingled?

[Allegory]

Would it be like in Genesis 2:16 + 17, where
every tree + not every tree mingled = "surely die"?

Would it be like in Genesis 6-8, where
mingled clean + unclean = "flood of waters"?

Would it be like in the prophet Daniel, where
mingled light + darkness = "abomination of desolation"?

Would it be like in Mt 12:37, 2Cor 3:9, Col 3:5, where
mingled justified + condemned = "condemnation"?

Would it be like in Mark 12:27, where
mingled life and death = "greatly err"?

Would it be like in Galatians 1:8,9 where
mingled blessed + cursed = "accursed"?

Would it be like in Colossians 3:5, where
mingled good + evil = "evil concupiscence"?

Would it be like in 1Thessalonians 5:3, where
mingled salvation + destruction = "not escape"?

Would it be like in Hebrews 7:23, where
mingled above + under = "death" (under-taker)?

Would it be like in James 1:8, where
mingled grace + law = "double minded"?

Would it be like in James 3: all, where
mingled sweet + bitter = "deadly poison"?

Would it be like in Jude 1:4,5, where
mingled saved + destroyed = "lasciviousness"?

Would it be like in Revelation 3:16, where
mingled hot + cold = "lukewarm"?

Is it why Christ would not receive "mingled" drink?