Why do we say "For fools rush in where angels fear to tread"?

Meaning:

Impetuous people often act unwisely in situations that people with more experience would approach with caution.

Background:

This expression traces to a 1711 poem by Alexander Pope titled An Essay on Criticism.

Such shameless bards we have; and yet 'tis true,
There are as mad, abandon'd critics too.
The bookful blockhead, ignorantly read,
With loads of learned lumber in his head,
With his own tongue still edifies his ears,
And always list'ning to himself appears.
All books he reads, and all he reads assails,
From Dryden's Fables down to Durfey's Tales.
With him, most authors steal their works, or buy;
Garth did not write his own Dispensary .
Name a new play, and he's the poet's friend,
Nay show'd his faults—but when would poets mend?
No place so sacred from such fops is barr'd,
Nor is Paul's church more safe than Paul's churchyard:
Nay, fly to altars; there they'll talk you dead:
For fools rush in where angels fear to tread.
Distrustful sense with modest caution speaks;
It still looks home, and short excursions makes;
But rattling nonsense in full volleys breaks;
And never shock'd, and never turn'd aside,
Bursts out, resistless, with a thund'ring tide
Lines 613-633

An Essay on Criticism is also the source of at least two other well known expressions: "To err is human, to forgive divine" and "a little learning is a dang'rous thing."

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