While I certainly wouldn't recommend it, yes, I unfortunately have done this to trigger myself before too.
Part of the reason for my doing it is like you said: pushing the slight trigger I'm already feeling over the edge so that I just go ahead and SI. Another reason I sometimes do it is that it gives me the sick pleasure of seeing self-harm cuts without actually hurting
myself. Sometimes I'm actually able to look at a bunch of images and get my 'self-harm fill' without hurting myself afterwards (this doesn't always happen though). Either way, I know that it's not a good idea and am trying not to do it anymore, or at least not as frequently.
So you're definitely
not a freak, but instead of further fueling your triggered mood, it would be a better alternative to do something completely
non-SI-related, like going for a walk or a run, calling or visiting a friend, watching a happy/funny movie, listening to peaceful music, etc.