What is the moral behind "There Will Come Soft Rains"?

There always seems to be a cautionary note in the way that
science fiction writers like Bradbury construct their future worlds. They offer us a
glimpse of one possible future which we could be heading towards, and by so doing hope
to correct the various excesses or attitudes that could be responsible for leading to
that future. In a sense, they act as fortune tellers by tantalising us with visions of
the future, but then empowering us to be able to change ourselves now to prevent
destruction later.

Let us consider what Bradbury might be
trying to warn us about in this excellent story. What is notable in this tale is the
complete absence of any human characters. The only mention of any humans in the story is
the outline that they left against the wall of the house when they were consumed by
flames:

The
five spots of paint--the man, the woman, the children, the ball--remained. The rest was
a thin charcoaled layer.

We
are presented with a house that demonstrates the incredible scientific advances of man
with its technology. Human beings almost have to do nothing because the house does it
for them. And yet, it is the same minds that have reached this level of technological
sophistication that have also created weaponry capable of annihilating the entire
species of humanity. The irony of this is evident.

Bradbury
therefore seems to be suggesting that this technology and scientific advancement that we
are achieving (after all we are progressing so rapidly) is great, but that if we do not
have wisdom to know how to use such science correctly, then what is the point? We are
not as safe and secure as we think we are, and by presenting us with a picture of nature
carrying on perfectly happily without us, Bradbury tries to highlight our vulnerable
position.