Varför släppte de kloner av Alice och fick dem dödade i Resident Evil: Extinction?

Dr. Isaacs försökte tämligen täla eller bota zombierna med hjälp av hennes blod, detta var ett tidigt mål för paraply efter utbrottet. Syftet med simuleringarna som de hade klonerna i var att testa dem för att se hur mycket av de ursprungliga Alice förmågorna (och därmed bindning av viruset) de hade och återskapa hennes immunitet.

She then goes after Isaacs, but he manages to escape, however, not before being bitten by an advanced version of a zombie which he had tried to domesticate using blood samples from Alice's clones (which Isaacs, as seen at the beginning of the film, had been testing for any similarities to the authentic Alice's physical and mental capabilities). Those left head to the Umbrella base and the now-infected Carlos briefly kisses Alice before driving an oil truck loaded with dynamite into a horde of zombies to clear the way. The convoy leaves on helicopter while Alice stays behind. She meets with the White Queen who informs her that the cure to the infection would lie in Alice's blood. Wiki

Från en annan wiki:

As she had not succumbed to the T-virus and transformed into a Zombie, the acquisition of Alice became a major goal to the company as a means of surviving the pandemic. Alice

After the worldwide pandemic turned most of the population into Undead, Dr. Isaacs continued Program Alice via cloning, trying to perfect a way to neutralize the Undead. Eventually, his research hit a wall, and it became necessary to find the original Alice.Project Alice

The Alice clones are perfect clones of the original Alice. They were created for several purposes, with some being test subjects for Umbrella Prime and others retaining all of the original's physical and psionic abilities. These clones were specifically created to derive a strain of the t-Virus to reverse the ravenous effects of the original virus in the undead population by increasing their intelligence.Clones

Och äntligen från skriptet:

COMMANDER OKAMOTO: And what of domestication? What news of Project Alice?

DOCTOR ISAACS: Our goals remain unchanged. The original Project Alice was unique. She bonded with the T-virus on a cellular level ... somehow managed to overcome it. Using antibodies from her blood, we could develop a serum that could not just combat the effects of the T-virus, but potentially reverse it.

...

DOCTOR ISAACS: Without the original Project Alice, progress has been difficult. We have been forced to try and replicate her using cloned genetic models ... giveng them selective memories, and actual physical stimuli on the training floor. Trying to shortcut all the experience that led her to the point of immunity. It's laborious and the results unpredictable.

Eftersom de inte hade den ursprungliga Alice försökte de inte bara återskapa henne som en klon, de försökte återskapa sina erfarenheter (därav simuleringen av bikupan) för att få det immunitetsresultat de önskade.

Eftersom de försökte hitta ett sätt att domesticera de smittade och använde kloner av Alice för att hitta en som hade samma förmågor och / eller blod som originalet för att skapa ett sätt att tämja dem.