Curses! Curses!

For the next two weeks, we'll be reading about the ten plagues--seven this week, three the next.
The irony is, that had Hashem kept the end goal of freeing the Jewish slaves, those curses would have been cut down to five.  The rest--and the drowning of the Egyptians--was all on G-d.
Seroiusly, how much could G-d have been weeping for all the drowned Egyptians.  After the fifth plague, it was G-d who kept hardening Pharaoh's heart--thus causing more plagues.  It's like G-d wanted to destroy them for no good reason--especially since the enslavement was part of G-d's plan.  Even Avroham knew that his descendants would be slaves for 400 years.  So why did G-d do it?  Did he just want to show the world that He was the biggest badass on the block?