Nothing unethical about it at all.
Nothing unethical about resurrecting an extinct animal if either the process or the result brings humanity net benefits.
Nothing unethical about purposedly causing the extinction of an animal if either the process or the result brings humanity net benefits.
Nothing unethical about resurrecting an extinct animal if either the process or the result brings humanity net benefits.
Nothing unethical about purposedly causing the extinction of an animal if either the process or the result brings humanity net benefits.