Yes!! Although I study children and the environment that they grow up in, I would never do a study where I randomly give children to parents to see the effect of the environment that you assign children to live in!
Yes, if I think there is little or no scientific reason for doing an animal experiment I will not allow it. I’m comfortable with the use of animals in research in the first place as long as it is controlled, necessary and mindful of the animals health and welfare. In the UK one of the strictest laws governs what can and can’t be done with animals – and who can and can’t do it.
Again with stem cells I’m all for it as long as the experiments are to help cure people (but not create people) or save lives.
And of course, if the medicines are likely to cause harm to the patients (based on the tests I perform) then I must morally object to them being given to those patients.