I can understand the suicide taboo among players around the table, but in a world where resurrection magic is something the party has reliably access to (daily starting with the 3rd level Revify, which bring dead people back if you act quickly, later with raise dead at 5th level), you most likely wouldn't see dying as such a traumatic event it is in our society, since it is, at most, a temporary experience... Unless your settings has active gods who actually have an unfavorable view on suicide/assisted suicide, it could be seen as a mode of treatment for many "uncurable illness". Death, once triviliazed since you can "easily" get around it, shouldn't scare PCs as much as it does in our world. Even in our world, not all culture saw suicide as something inherently bad (Japan, India, in some ways Ancient Greece). To answer the OP, I am not particularly surprised by this strategy, in character and not as a metagaming tactic. Relation to death would be extremely different for people wit the knowledge to come back.
I can see it especially well in the context of the urgency. "yes, we all accept to die and reincarnate to have a chance to accomplish our goal. Its a harrowing experience to die and live in another body, but I'll do that for the sake of the mission". We have countless examples of soldiers self-sacrificing to save others, why not when their survival is guaranteed by the use of available magic?
I can see it especially well in the context of the urgency. "yes, we all accept to die and reincarnate to have a chance to accomplish our goal. Its a harrowing experience to die and live in another body, but I'll do that for the sake of the mission". We have countless examples of soldiers self-sacrificing to save others, why not when their survival is guaranteed by the use of available magic?