The miracles of the martyrs are not ends in themselves, they are testimonies ("witnesses") to our faith in the physical resurrection of Christ. To that end, we should not be trusting in the martyrs, but rather in the God who enables them to die in the faith and as witnesses for the faith.
Again, it is not the miracles themselves which we should notice--even the demons can do those things. What we should notice is that God whom the martyrs worship. He is the final end of their lives and deaths.