Alexander Tozawa is the adopted- son of a successful Japanese businessman, whom is a respected executive in a fortune five hundred company. Essentially born with a silver spoon in his mouth and got a lot of what he wanted growing up due to the privledges such a thing afforded him. Coming from a very cutthroat line of work, his father had gained a reputation of getting what his company needed done no matter the cost nor the line to the point it held borderline-sociopathic in nature. Something his son would've inherited from his father as he was being groomed to follow in his father's footsteps.
Unfortunately for that of his father, Alexander wasn't enthralled in the world of business, but instead human nature within itself. Living amongst the wealthy and the privileged all of his life where many of them would treat both their 'underlings' and the lower class with little regard caused his view upon human life to become skewed from a very early age, seeing how easily one stepped upon another just to climb a tiiiiny bit higher in their professional or personal life.
Even before the outbreak, he's viewed human kind as a form of monsterhood, as a culture that lived in the shadows, intent hidden behind the lies that they'd tell themselves and those around them in order to feel okay with the actions they indeed did partake within. He'd have seen it from the lowest level of petty criminals, to the higher scale business men that didn't think twice before screwing over thousands, or millions even if it meant profit.
So because of this, he actually wanted to get even further into human emotion, into the human mind. Hence why he started abducting native residents during business trips, absolutely testing them, to see how their mind worked, how it reacted. They were little more then test animals to him. Which is how he'd have attained the title of 'serial killer' as many of said victims never went on to regain their lost freedom. Due to this, he was found and sentenced within Chernarus, sent to one of the asylums within the country, the same one that Seth Black hailed from, to where he remained until the outbreak occured and mayham happened within the lands.