It gets difficult to find them sometimes, depending on who removed it and from where. If a moderator, from the community, removed it then the removal reason could have originated from where the community is located at, whereas if an administrator of an instance removed it then it would be elsewhere.
For all that the lemmy.ml admins enjoy going on sprees of mass-removals, it sure would be nice if they would add to the code a way to see the reasons for removal linked to directly from the comment itself.