Why did He allow Pharoah's heart to be hardened?
The whole issue is that God didn't
allow Pharoah's heart to be hardened - God actually hardened it.
You're either missing or dodging the point that CK makes quite unambiguosly in
Message 141:
God EXPLICITLY states that it is he who has hardnened the pharoah's heart - he says it at least THREE times.
Brian had previously provided the Chapter and Verse where it states that God hardens Pharoah's heart in
Message 137:
The Bible explicitly states that God made it impossible for pharaoh to let the Israelites so that Yahweh could show off.
Exod. 7:3-5
But I will harden Pharaoh's heart, and though I multiply my miraculous signs and wonders in Egypt, he will not listen to you. Then I will lay my hand on Egypt and with mighty acts of judgment I will bring out my divisions, my people the Israelites. And the Egyptians will know that I am the LORD when I stretch out my hand against Egypt and bring the Israelites out of it."
Exod 9:12
12 But the LORD hardened Pharaoh's heart and he would not listen to Moses and Aaron, just as the LORD had said to Moses.
This one has Yahweh happily announcing that He is desperate to slaughter Egyptians to quench His thirst for blood.
Exod. 10:1
Then the LORD said to Moses, "Go to Pharaoh, for I have hardened his heart and the hearts of his officials so that I may perform these miraculous signs of mine among them
Exod. 11:10
Moses and Aaron performed all these wonders before Pharaoh, but the LORD hardened Pharaoh's heart, and he would not let the Israelites go out of his country.
Never put off until tomorrow what you can put off until the day after