Possibly because if you make an experiment out of is, then there's ethical concerns that you might have to consider (or worry about other people throwing in you

Possibly because if you make an experiment out of is, then there's ethical concerns that you might have to consider (or worry about other people throwing in your face), where as if you just do it because of your stated belief it would help, then that specific problem is no longer a concern. It's impossible to rationally consider all the myriad decisions we must make in the modern day, so people rely on rules-of-thumb that work in most cases (or we hope they work in most cases). For example, "don't perform medical experiments on people that may cause them more hard than not experimenting". Unfortunately, we often start relying on the rule-of-thumb as the reason instead of the heuristic that helps us short-circuit a rigorous rational reasoning, and then we end up with people using those rules of thumb why to deny, or criticize, actions where it makes no sense.