Git pull.rebase this is a possibly dangerous operation

Git pull.rebase this is a possibly dangerous operation

In the git-config documentation the information about pull.rebase:
pull.rebase
When true, rebase branches on top of the fetched branch, instead of
merging the default branch from the default remote when "git pull" is run.
See "branch..rebase" for setting this on a per-branch basis.
NOTE: this is a possibly dangerous operation; do not use it unless you
understand the implications (see git-rebase(1) for details).
Could anybody describe in details what does "NOTE: this is a possibly
dangerous operation; do not use it unless you understand the implications
(see git-rebase(1) for details)" mean?