Here are some numbers from my past experiences.
Through out the years I have served in 7 different spanish congregations. Here we go:
Congregation #1 (In Oklahoma)
125 publishers, 3 judicial cases in 4 years, 0 disfelloshipped, 2 elders
Congregation #2 (In Texas)
65 publishers, 0 judicial cases in 2 1/2 years, 2 elders
Congregation #3 (In Nicaragua, Central America)
155 publishers, 6 judicial cases in 2 years, 1 disfellowshipped, 3 elders
Congregation #4 (In Nicaragua, Central America)
85 publishers, 2 judicial cases in 1 year, 2 disfellowshipped, 1 elder
Congregation #5 (In Texas)
90 publishers, 4 judicial cases in 3 years, 0 disfellowshipped, 4 elders
Congregation #6 (In Texas)
95 publishers, 3 judicial cases in 4 years, 2 disfellowshipped, 4 elders, 1 judicial case was of a child abuse, but following Legal Dept. guidelines, the person was turned into the authorities and he is now serving 99 year sentence.
Congregation #7 (current congregation in Texas that I serve in)
160 publishers, 0 judicial cases in the last 2 years, 5 elders.
The injustices that you describe all happened around you, so you might be the problem. They don't happen in all congregations. I've enjoyed service in all the congregation and have always served Jehovah wholeheartedly. Jehovah permits certain things in congregations in order to see what we're all made of.