Why Does God Blind Eyes?

I think the reason is twofold.

First, God blinds both the eyes of the elect and non-elect, because it allows God to progressively reveal more and more about Himself to the watching world. In that sense it's merely a proof that we are creatures and He is God. By starting everyone under condemnation, everyone starts in a position to understand grace, which is really what He's after.

Second, God blinds eyes because He's simply too much for our fallen beings to accept without annihilation. Moses wanted to see God, but God informed him that being too near to Him would destroy him.  God's distance shelters weak and sinful creatures just as distance from the sun keeps things from spontaneous combustion. So while separation from God is indeed a great problem, it's also a kindness for sinners that we do not behold the dazzling brightness of God, and are not instantly undone.

God Punishes Men By Giving Them Success

Nowhere is this more clear than in the recent sensation "The Shack", a book that speaks against God as He has revealed Himself in Scripture. If I were God and someone wanted to write a book blaspheming me I'd use my power to ensure that the book was terrifically unpopular and that nobody ever read it. But does God do that? Indeed not. He puts it into the hand of everyone and permits it to go on to be a runaway best seller which rolls over the a million copies sold mark and makes both the author and the publisher rich. 

And then God punishes them. 

http://www.latimes.com/entertainment/news/la-et-the-shack-20100713,0,6240949.story

As He Himself said, "But they that will be rich fall into temptation and a snare, and into many foolish and hurtful lusts, which drown men in destruction and perdition. For the love of money is the root of all evil: which while some coveted after, they have erred from the faith, and pierced themselves through with many sorrows. But thou, O man of God, flee these things; and follow after righteousness, godliness, faith, love, patience, meekness." (1 Tim 6:9-11)

There is no Stability in High Calvinism

I have lately taken to thinking that there is really no stability in the idea that Christ made no atonement whatsoever for the non-elect. Try as I might I don't see how it is defensible to say that the death of Christ on the cross is of no benefit to them. If Christ doesn't buy at least a temporary pardon for the non-elect then there is no such thing as common grace, but common grace is explicitly affirmed in Scripture. If He doesn't make an atonement in any way then for some men salvation is flatly impossible regardless of whether they believe or not. But John 3:16 indicates that those who believe will be saved. 

High Calvinism then is based on a logical chain of reasoning and arguments that I think is more correct and water tight in hyper Calvinism. Most Calvinists are saved from a full commitment to hyper-Calvinism because they are unwilling to follow through on the logical conclusions of their beliefs, and that's a good thing.
In short, my suspicions are that High Calvinism looks like a muddy and unstable middle ground that gives way to either the moderate or Hyper position when pressed.