Sinners in the Hands of an Angry God vs. Of Plymouth Plantation

After reading Of Plymouth Plantation and watching Sinners in the Hands of an Angry God, I have come to a confused halt. Of Plymouth Plantation shows normal people experiencing life in a new place. These people seem kind and smart in the way they talk to the Indians. They even made a treaty with these Native Americans. In the treaty they decided this:
1) That neither he nor any of his should injure or do hurt to any of their people.
2) That if any of his did hurt to any of theirs, he should send the offender, that they might punish him.
3) That if anything were taken away from any of theirs, he should cause it to be restored; and they should do the like to his.
4) If any did unjustly war against him, they would aid him; if any did war against them, he should aid them.
5) He should send to his neighbors confederates to certify them of this, that they might not wrong them, but might be likewise comprised in the conditions of peace.
6) That when their men came to them, they should leave their bows and arrows behind them.
I believe that these points of their treaty are pretty rational. The Puritans even took one of the Natives in with them, Squanto was his name. They treated him like a friend and keep him with them until the day he died.
The first harvest even seemed normal. They caught the fish, rounded up the turkeys and the Indians harvested corn for the Puritans. There was enough for everybody. The houses were fixed up for winter and everyone was happy and in good health. This was nothing like what I watched in the sermon.
Its almost like these people cannot be the same. They seem so nice and free spirited in Of Plymouth Plantation, but everything seems so scary in Sinners in the Hands of an Angry God. The preacher talkes of how everybody in that church is going to hell and that there is no salvation, no hope for them. That God looks at these people with disgust. He says that the way a human hates the most venomous snake in the world, God hates these people ten times more than that. I just don’t understand how these people act so normal when they are convinced that their fate is hell.