Since I am usually a very calm guy, I seldom get angry at something, so I had to think about this question for quite some time. At first nothing really popped up in my head, only things which are bothering me but not creating real anger.
To find an answer I had to think back to the moments where I felt a little anger against someone or something. So I found one thing that is making me angry: Selfishness!
People who don’t watch out for others or show no respect to them can make me really angry. The most common situation I find myself in is, where I stand at the bus stop or train station and a smoker arrives, lighting a cigarette and placing himself right next to me or other nonsmokers. Of course there are also respectful smokers who take care that the smoke stays away from everybody and stay inside the smoking areas, but smoking right next to nonsmokers without asking if it’s okay is just selfish in my eyes.
The sad thing is that I have the feeling, that people in this world are getting more and more selfish and loosing their respect of each other. In my opinion being selfish hasn’t been thought through completely.
When we look at the climate change for example we can see that it is impossible to fight against it without working together. American’s president Trump’s withdraw of the USA out of the Paris Climate Agreement shows how selfishness can hurt the whole society. He did it because the agreement put the United States in “a very, very big economic disadvantage“, so a selfish reason. The problem is that the negative effects which will resolve out of this decision will have an effect on every human on earth, while at first it seems to be profitable for America itself to be able to spend the saved money on something else. The problem is that if everyone wants to have these advantages, the whole system would collapse (in this case the earth) and everybody looses. So to be successful in the long run it would be better for everyone to work together without thinking about his own.
But every society can bear some amount of selfishness before collapsing. If for example all the countries of the world would save some more emissions, they could make up for all the extra emissions from America and the system could still hold while America takes his advantages from the society. (I know this is very simplified, but it roughly works this way).
One could also see it as some kind of crowd funding, if everyone gives a little then a lot can be achieved. This system could be applied in many situations in daily life, for example keeping your lane in traffic jams (although the other one seems to go faster) or to use plastic bags multiple times to save some small emissions. Every little helps.
In the end everyone has to decide on ones own about how much one can or wants to give into a society and how much one takes out of it. Although one must consider that if everyone tries to maximize his gain, nobody would get anything.