For example, bombing military forces using human shields as cover. Very practical, considered unethical and hence not practiced. (Same applies to the inverse, using civilians as shields.)

Eugenics, practiced to advance the human genome by artificial selection. Practical, not ethical!

During war, placing people of the same race as the enemy into concentration camps. Practical, no longer considered ethical, thankfully!

Testing drugs on the clinically insane and on criminals, or of humans of different races. Practical, not ethical.

Enslaving people of a different race to work plantations. Practical! No longer considered ethical!

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For testing between outbreaks, how about instead of your strawmen, we try infecting lab-grown specimens of non-sentient tissue with Ebola? This is the 21st century, we can grow entire organs [1]. Even barring that, tissue from organ donor cadavers can be used.

[1] http://www.telegraph.co.uk/science/science-news/10275996/The...

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And one more thing:

Deliberately infect humans to be used as test subjects?

Why do you see this as different/worse than deliberately infecting other primates?

Is it because they do not have advanced technology?

Is it because they do not speak our language?

Is it because they cannot resist us?

Is it because they are not chosen by your God?

Is it because they look different than you?

Is it because you have no social links with them?

Is it because, despite overwhelming scientific evidence to the contrary, you believe them not to be capable of thought and feeling?

Something else I haven't listed?

Everyone who downvotes me, I challenge you to answer this question. It's the least you can do if you don't doubt yourself.