In the 5th season, Peter tortures an observer. But this is displayed in a dark light, and the torture fails. It's not glorified. It's in fact the dark side,

In the 5th season, Peter tortures an observer. But this is displayed in a dark light, and the torture fails. It's not glorified. It's in fact the dark side, a counter-balance to Olivia's mourning. Basically, it's portrayed as a horrific, shocking action, made all the more horrible because of who's doing it. It's the first steps down a darker road for Peter. So, yeah, not at all propaganda supporting torture.