Can a big group for people get a long with every one in that community?

Can a big group for people get along with every one in that community? I think that to

an extent they can even if there are people that try to get other people mad at each other.
People who spread bad rumors would be in this group and also try to start fights out of little things.

Then some times people just get mad for dumb reasons.
A dumb reason would be to believe a rumor without checking it out first.
That's why people should not even listen to rumors like supposedly someone said something bad about them.
So I think people in Neighborhoods should focus on the good things and not the rumors.
If they hear a rumor

about them you can just go to there house and talk to them or some thing like that.
The community should do fun things together like my neighborhood did a block party.
Everyone got together to talk and eat. This would help you get to know people so you wouldn't be
tempted to start rumors about them. Also you would get to know the people in your community so if there
is a problem you are more comfortable talking to them.