1)
Why did Hashem harden their hearts, and cause that they not make Shalom?
1.
Radak #1: This was their punishment for their sin, just like Hashem hardened Pharaoh's heart. Malbim #1
2)
What is "Techinah"?
1.
Malbim: It is like Chaninah (grace); Radak - and mercy.