30 year cold case from 1995 finally solved - An entire town failed to do their jobs - south texas

OK lets try this again since my posy got deleted

my sister was murdered 30 years ago. Her case went cold and it was a cold case for 29 years. Last year a Texas ranger reached out to my family to let us know they would be opening her case again. After a year of being opened her case was solved. Her rapist and Murder is sitting in a jail cell.

but my question is, why was this case not solved 30 years ago? I've asked the Rangers and detectives on the case now and they gave me the most simplest answer. They were lazy in 1995. They had DNA - his seman that was inside of her. She was strangled and that was obvious to the medical examiner and the fire marshal had ruled the fire as arson and not accidental.

The police report, stops after the 3rd page. literally stops mid sentenced and was never finished. Why didnt they do an investigation? Why was the DNA tested for the first time after 30 years? Why did the police and fire marshal NOT look into the fire knowing it was set on purpose and as a way to cover up my sisters body. Not one news article. Not one headline. Not one story anywhere from the local news or internet about a 9 year old. girl in a small town being brutally raped and murdered.

The Texas Ranger told us that the local police department, the medical examiner and the fire marshal all failed my sister because they did nothing to try and find out what happened and who did it. just a half ass written report that stops mid sentence NEVER finished, 5 crime seen photos and no one opened up any type of investigation to find out the truth. We have been advised to contact a lawyer, but they couldn't tell us why we should contact one or what kind.

They failed her. A tiny town in the middle of texas, whos known for corruption and pure laziness failed my 9 year old sister the day she was taken from us.i feel like everyone who was involved in her case should be held accountable for sweeping it under the rug and acting like it didn't happen and just forgetting about her.

Is this something we can legally sue for? are their lawyers or anyone in legal who would look into WHY no investigations were ever done and would help us hold the people who ignored this case responsible for not offering justice over 30 years?