Confused about github rebasing

[Sean Cavanaugh]

On 3/15/2012 3:56 PM, Alex Rønne Petersen wrote:
> On 15-03-2012 21:53, Gour wrote:
>> On Thu, 15 Mar 2012 13:49:14 -0700
>> "H. S. Teoh"<hsteoh at quickfur.ath.cx> wrote:
>>
>>> Another question. How to I repair my current history, which is all
>>> messed up now?
>>
>> By not using DVCS which allows you to rewrite history (hint: check
>> Fossil). ;)
>
> It's perfectly useful in DVCS. Without it, you'd have a mess of a
> history when you send your changes upstream. That's not really acceptable.
>

Why would you delete history?  Thats pretty much the primary purpose of 
source control.