So, we love animals. None of us WANT to hurt them. We got INTO this field because we all want to understand them in order to help keep them around for future generations.
That said... My job requires me to do a few things that require me to basically turn off my emotions and concentrate on the research... It’s only possible to postpone though and I always question everything about why I’m doing this, how to minimize suffering, and whether there is any other way. Even when the answer is that it’s required it still keeps me up at night and one experiment from undergrad still makes me cry at least once a year and really question whether that one experiment made me a bad person.