Hey doc. I agree with you completely that quacks and laymen should not express a medical opinion. Likewise, doctors or surgeons should never express a legal opinion unless they are qualified to do so
Your hypotheses on whether the deceased is a rapist is flawed for the following reason in my opinion. The deceased responded with "offensive language" when questioned by the father. Now if he had raped the child, why would he do that? Wouldn't the average person when confronted with an accusation of a crime by the victim or the victim's family want to leave the crime scene as soon as possible and not linger around to be abusive towards the accuser? The only witness to this murder is the father it seems. Dead men tell no tales so the deceased's version is ruled out here. Is it not possible that the deceased being innocent, was so affronted by the accusation that he became abusive when accused of the crime ? If the guy is guilty then he deserved to be punished...but mob justice or vigilantism is a double edged sword. It could result in the death of an innocent person. If people are so aggrieved with the lack of speedy justice then they need to address this with the legislators. Taking the law into their own hands will simply take us back to the stone age days
FYI, in medical college we learn Psychology,Forensic Medicine,Penal codes which most of the policemen learn too same as us,so we do know what is legal and what is not, i can tell you a 100 ways to kill a person and make his body disappear as long as no body is found there is no case, just a missing persons report and i will even get a perfect alibi if someone comes investigating. Why do you think the police uses forensics team in a crime scene.The general psychology of a greenhorn culprit is fear and anxiety as you said above,
while hardened criminals and repeat offenders are calm and cool as they know how to walk out of this thing as they did it before.I will give you a simple example in a alley mugging or school yard fight, those who keep looking behind or above your shoulder,anxious,frequently hopping and restless are new to that thing, while the professionals are calm and cool as they know the ropes that itself should tell you to GTFO there.
The confidence, no remorse and the Offensive language show that he has committed this crime earlier too.
I agree Mob justice is no way, but sometimes people do it out of rage and crime committed in a fit of rage will carry lesser punishment than committing a cold blooded murder.
The Indian courts are presently overburdened with cases and it takes lot of time for it to be done, not to mention the social stigma and investigation carried out by the police it will carry.Some fear that this thing getting out in society will spoil the other children's future and they might not get married.
I presume the father must have other children at home as well most probably a girl other than the victim.
Regarding what you said about the culprit not lingering around and rushing away from the scene, most culprits stay in the scene and try to find and glean information out of a crime scene so that they can be sure they covered their tracks and have a perfect alibi.
This is truth in many criminal investigations ,arson etc. as the culprit can be found somewhere in the locality watching and acting as innocent.