what will you do when all the problems around you eroded your head?

few weeks ago my brother involved in an accident which is not that bad because there are no deaths or injuries found, the problem was the complexity of the situation faced by my family and my brother had to overcome a tough discussion with the person involved......

the story begins like this, my brother is on his way back home after loitering near Damansara if im not mistaken, when he was close to a junction,my brother's car is followed by a motorcycle from close range ...... ok, here's the case, my brother put on a signal to enter the junction, the motor somehow thought that my brother does not want to change direction, but he felt my brother was setting himself into the same lane ..... what happens next is, the motorcyclists and pillion hit my brother's car and the pillion falled to the ground but both the motorcyclist and the pillion just had a small wound ...... the rider shows his expression of anger and seemed like want to beat my brother with a helmet, he said to my brother: bang, bang see my girlfriend, What is this? My brother said: don't worry brother, first, we send her to the hospital, after she got the proper treatment we settle this problem as soon as possible .....
If we fight now, there's no use,
30 mins later
friend of my brother arrived on the scene and helped him bring the motorcycle involved ...
two days later (to summarize the story)

although my brother had repair and pay all the hospital expenditures, including compensation of RM 50 because of the injuries, but minor problem of this accident has caused dissatisfaction parties, the problem becomes more complicated when the parties involved threatened my brother to pay more as they did not satisfied with the amount of the compensation offered by my brother ....... added, the problem still persists,they often calls him to frighten him, this problem has caused my brother to change his phone number because they are resistant with their action which is considered very extreme ......wth, what do they want more???is it still not enough after we paid for all the expenditures plus we already repaired the motorcycle for him,and the bad truth is,it was not 100% my brother's fault...

me on behalf of my family really hope that civilians and road users will follow the road regulations before blaming others and don't pretend to be right if you wrong, you have to accept the fact if you are totally wrong, other countries like Japan really good in dealing with this matter because they do not practice violence in solving problems ....... they always use the concept in which all parties have their own errors, such techniques that they practiced in Japan is 70-30, 50-50, or 80-20 in every problem, but for certain cases the possibility of the problem may up to 100% if it is intentional errors .
If seen in the case of my brother, he is not guilty because he really did turn on the signal light, but police in favor of their own parties even though they were not on the spot, why?? making assumptions is not supposed to be right, they should search for the evidence to be 100% sure, and if they do not use the proper way,they are just being very unhelpful in solving the case in the right way .....

we expect the authorities will discharge their duties more efficiently and perform a thorough examination before making unreasonable assumptions...