Bias does not necessitate dogmatism. I've read at least one non-dogmatic Catholic priest on suicide.

There's just nothing "scientific" about these sorts of opinions, though, from either side.

Edit to add: I was taking the term "dogmatic" as the colloquial usage. There are ideas about freedom, suffering, and the role of government or physicians that are effectively secular dogmas pertinent to assisted suicide. And many Catholics have personal (non-dogmatic) reasons for their beliefs. Even strong believers pick and choose which parts of religious dogma they find authoritative.