Lawl.
I don't think they're like human scientists. Vykkers are more widely 'accepted' in Oddworld and aren't thought of as cruel in the same sense as we look at those who experiment on animals for pharmeceutical reasons (but for shampoo or soap? What do they put in it that's dangerous in the first place that needs testing?). Vykkers do it more for their own pleasure in inflicting pain, then just sell stuff on the side to pay for their twisted pastimes. Humans do it to either make money (...that isn't a whole lot more moral, is it?) or to create new medical products.
Depends on the type of scientist you're looking at, normal or twisted, cruel a*shole.