Shooting wildlife or scenery is not insignificant when that wildlife or scenery is disappearing at an ever-increasing rate. How many more photos do you think there will be of the Iromote Cat or the Amo Leopard? Very few. What about the Golden Toad? None, since it's now extinct.
Would that there were photographs of the Passenger Pigeon, or the Dodo.
Yes, I know. Do we need pictures of common songbirds? There are, after all, millions of them. In the 1700s, there were millions of passenger pigeons. Flocks were big enough to darkened the sky and break the branches of trees. I haven't seen one lately, though.
As for scenery, have you ever seen a photo of the Valley of the Smokes? Neither have I. Nor will we. It's gone, forever.
Even if only from casual photographers, pictures may outlast their subjects. It happens all the time.
Besides, there are so few real pleasures in life. There is absolutely nothing wrong with merely enjoying onesself, and with sharing that joy. And that, to me, is one of the essences of photography.