Why Did Solid Snake Kill Venom Snake

In outer heaven he was sent in to investigate the base and rescue gray fox eventually succeeds his mission and takes down venom as he was both a threat to the us and out of principle becuase his former commander had betrayed him.
Why did solid snake kill venom snake. I dunno man according to the story solid snake beat venom snake in a 1v1. Even if he didn t expect the rookie snake to succeed he still screwed venom by sending in someone to kill him. Big boss thinks and states on a few occasions that he doesn t think genes make the man. Despite knowing solid snake is his son he sends him in anyway.
The mbele squad when venom snake first met the mbele squad he was meant to kill them for their general. Big boss is weak to rockets to the face. In fairness the patriots did send solid to foxhound big boss sent him to outer heaven hoping he d fail. He told snake to infiltrate the base that venom was leading.
The idea was to first send in gray fox who was allied with big boss at least to some degree then send in a rookie when he was captured. Solid snake big boss returns as the leader of the enemy organization having survived the injuries he sustained in the original game as a cyborg. His human form and a fire breathing cyborg form. Venom was supposed to kill solid most likely because big boss realized the danger of having a trained clone of his running around.
Solid was sent in to fail and most likely die which is why you start running into ambushes later in metal gear 1. But after playing basically all the games except portable ops i don t think solid snake would ever outmatch venom even if he was at his peak. He fights solid snake as a boss prior to reaching the new metal gear prototype and has two forms. Aka snake many years after the events of snake eater a foxhound agent codenamed gray fox was sent on a mission to outer heaven to gather some info on what.
In snake s revenge a non canonical sequel to the original metal gear for the nes released during the same year as metal gear 2.