We should not be blaming people for His death. However, our sins did kill him, as he was our Passover sacrifice.
The world will suffer the Day of the Lord's Wrath because they do not follow the Ten Commandments and are taught they do not have to. This is an outright lie. The law was not done away with, Christ does not keep it for you, you simply receive a pardon from the death penalty. Any criminal would understand that if they were strapped into the electric chair, and the President pardoned him and allowed him to walk free, that it would not give him freedom to go out and repeatedly break the law again.
The law was not done away with, Christ himself stated that He did not come to destroy the law. It would be like saying people keep running stop signs, so solve the problem and get rid of all the stop signs! It's ridiculous.
That is why God is angry.
Ultimately that is what the mark of the Beast is- God takes note (marks) of those who obey a man referred to as the Beast instead of His saints that keep his commandments. Chapter 14 of Revelation talks about the group who does not take the mark of the Beast. Rev 14:12 is the key verse you should read to help understand what separates these two groups of people.