Besides: do you judge goodness of characted based on 'high income'???
No, not at all, but the guy who made the complaint to the police judges it as a chance to get plenty of money in compensation from a civil suit, and paid quickly, not in umpteen installments. That was the reason he made the complaint against the guy who intervened.
The accuseds' professions and salaries are printed on the Akta Oskarzenia, one a basic level doctor, from the former USSR, and the other a 'western businessman' earning more than six times as much. The lout who made the complaint wants money badly and this is a wonderful chance for him to get it.
In this case, the person who intervened didn't lift a finger, but the question is, how can he prove this? There is a witness, but not apparently neutral. And under Polish law, an allegation and a medical report consistent with the allegation are very hard to disprove.
BTW, the camera thing is a good idea. I stopped a burglary in the same way and my friend in UK took photos of some people lurking by the back door of a bank (next to his house) just before opening time. The police got there just in time, but the photos were used to catch the members of the group who got away.
As for differences between UK and Poland for crime - I was burgled 5 times in UK, but no street crime. I have never been burgled here, but had an (attempted) mugging here, in broad daylight and a stolen wallet, a stolen coat and two mobiles stolen. One good thing is that the local media in Warsaw publish 'crime maps', showing a red dot for each incident of street crime.
Out of interest, pickpocketing seems to be on the rise here - people only report it to the police if there are documents lost, but more and more people tell me it's happened to them recently.