A newcomer's question: Ownership of research and personal hostility.

Hello all.
Firstly, I want to thank those that have helped, and are helping me trace my ancestry, and who have given me many tips.

I wanted to ask: Since coming here, and to the Nueva Galicia Society and Ancestrydna.com, I have noticed some really heated and also hostile behavior between people, and heard names called, and seen some less than what I had assumed was professional behavior. Questions:

1: If one person does some research, and another person references or uses it directly is there a reason that would create bad blood?

2: I have heard researchers call one another "Plagiarists". This would suggest ownership of research. I would have thought that sharing research about a person's family line, would be a good thing. Am I wrong? are there negative things that can comer from this?

I have seen in several forums, people ignore pleas for help, and assistance, and then harshly criticize the person who was asking for help, railing against them for some error in their research or methodology.

Just wondering what the social lay of the land is here, and wondering what is going on with all the heated words, and hard feelings. I really didn't expect that.

Thanks for your time and patience.

Piero
Rookie researcher.