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they must only be used if alternative non-animal models cannot answer the scientific question
Animal testing is not necessary but it is only evil. There are other methods that can be applied without harming animals like testing on synthetic cells. The firms do not use them generally only because of their costs and people's biased trust on animal testing.
If the test has risks we owe more responsibility to a human patient than an animal one.
humans are animals
Why? This is like saying that you owe more support to a blood relation then a non-blood relation. In some situations a non-blood relation may be more important to you than a blood relation.
are there circumstances where animal testing is not evil? Is there "humane" testing possible?
the accent is on 'necessary', not on 'evil'
There is more humane testing possible, such as using lab grown human cells.
Killing an animal is never humane.