You can get a picture of the different flavors, on this video:
Certainly, Spurgeon is outstanding in faithfulness to God's word:
We get a picture of the dangers of Calvinism when 17th Century Puritans hung fellow Christians on the Boston Common. Also remember Jonathan Edwards, a faithful pastor, was a slave holder while Wesley, who was born the same year, exhorted Wilborforce to press on in the battle over slavery.
And more recently, in one of the top blogs, Chailles did not know if Charles Colson was one of the elect and said that he attacked the Gospel.
Calvinism is dangerous because of the things you mention? Let us take Jonathan Edwards who was a congregationist, who did believe in Election, and the bondage of one's will to sin. If he own slaves I do not know, and personally, do not care, for there is nothing ungodly about that. Our corrupt society has convinced men that it is wrong, not the scriptures! One whole NT book speaks of it during Paul's time. Philemon, and Paul could have rebuke Philemon of it, if ideed it was wrong, but he never did, but exhorted Onesimus to return back to Philemon. Read it, it is very short. Abraham one of the most faithful and godly men in the scriptures had servants! In one sense, so do I. I owe a small company, and have men that work for me, who do as I ask them to do, whether in the company or at my house, it makes no difference, and they do as I ask them, an in whatever I ask them. I can show anyone a burying pace here in South Carolina, where a slave was lay to rest at the feet of his master, at his request!
the words are on his tombstone are:
"Here I lay at the feet of my master, whom I served and loved."
So please, do not condemn a doctrine base upon the way men live. Right or wrong, there are men in all faith that we could spot out and try to condemn the doctrine that they believe in~let us prove a system right or wrong, base upon the holy scriptures, not on those may hold the same doctrine, as the doctrine itself is corrupt. It may be, and it may not be.