For
It helped humans reach space and understand risks.
Against
It causes suffering to animals who cannot consent.
Anonymous excerpts, translated where noted.
“But as others write, there is simply no alternative.”
“We come to a standstill in almost every respect. That sounds exaggerated, but unfortunately it isn't.”
“The animals suffer, of course.”
“So many cruel and unnecessary studies involving a great deal of animal suffering are carried out.”