***Wow you have absolutely no idea what you are talking about.***
Well, when you have read American Indian histories for the last 40 years as I have, then you can come and tell me I don't know what I am talking about.
Meanwhile you can also read...
ROMANCE AND TRAGEDY OF PIONEER LIFE"..by Augustus Lynch Mason (1883).
MASSACRES OF THE MOUNTAINS by J.p. Dunn Jr.
MY LIFE ON THE PLAINS by (trumpets and flourishes please),by Geo. Armstrong Custer.
TRIBAL WARS OF THE SOUTHERN PLAINS by Stan Hoig.
GREAT WESTERN INDIAN FIGHTS (University of Nebraska Press)
THE SAVAGE YEARS by Shepard Rifkin.
and about one thousand periodicals..
And this is just part of my personal library. Then hit the national public libraries and multiply that number by 10 and then come and talk to me.
Saying you dont know what your talking about was probably too harsh and i feel you may be misunderstanding certain practices.
"The Indians had no such qualms about these as they had no law."
Although Indians may not have had a specific list of laws, they did follow cultural laws and practices that are common in communal societies.
"Trappers reported Indians killing other Indians in camp over minor slights, and killing people just for the fun of it."
I have never heard of native americans killing just for the sake of killing. If these accounts of indians are from a trappers perspective then there is almost always a moderate to strong bias in the reports. Have you ever read Vespucci's account of the "savages" upon returning to Europe? It differs drastically from the accounts of Columbus' accounts. This was mainly due to Vespucci's wittnessing of "savage" acts and their customs regarding clothing and sexual behavior. Also, the reason Captain Cook was killed while off the coast of Hawaii was purely a huge religious misunderstanding which led to his death. Drastic cultural differences often caused huge distortions of taled of contact with natives.
"Indians stole anything they could get their hands on. The only killings during the Lewis and Clark exploration was of Blackfoot indians who had stolen a rifle and horse."
Often the practice of taking items from europeans and settlers had to do with the belief that these white men were sometimes a form of a diety, and by taking their possessions they would aquire the power and protection of these dieties. Likewise they would give back an equal or larger amount at a later time but by that time settlers equated it as theft. I do not deny that there was violence and without knowing the context of the events you mentioned i could be wrong.
"Indians considered it an honor to steal from others. Horses being a prime target. Theft brought them great honor among their own tribe."
Im not sure of this claim but you may have heard of "potlatching" which was a core institution in numerous western tribes. Potlatching is in a simplified explanation the attempt to aquire others belongings through a show of ones wealth, and an opposing tribal member would have to offer the same amount of wealth to either burn or to loan to the other person. Many westerners did not have any understanding of this practice and assumed it was just an aggressive act of theft and probably reported it with such bias.
"Indians thought nothing of traveling hundreds of miles just to raid a tribe or town."
I dont know how far into western colonization these accounts were but in later stages of western progression this did indeed happen.
I dont know your sources so im making educated guesses based on the last 4 months of in depth study of Native American cultural and religious traditions.
Oh and to people who scoff at how they were unwilling to change their cultural and religious practices after european colonization is simply explained that there was no need for them to change in their mind. They had lived in realitive harmony with the earth for hundreds of years and to them it was the equivalent of alien beings arriving with technology 1000 years ahead and trying to convert everyone to an odd religion.