And this is by his saying and ascribing it to them: "Everyone who embarks upon making the call to Allaah 
but he has 
some mistakes, then it is not permissible to accept any of his 
goodness, nor his 
da'wah and nor his jihaad..." 
And I shall soon quote the words of Shaikh Rabee in his 
refutation of 
al-Haddaad and after that it will become clear - are the words 
of ash-Shaayijee 
correct or not? 
Al-Haddaad said: "As for the Khawaarij - may Allaah disfigure 
their 
affair - then be cautious of them and caution whoever you meet 
against them for 
by Allaah, they are the most of evil of creation as the 
Messenger  (sallallaahu alayhi wasallam)  has 
described them. And their jihaad or other than that (from their 
actions) - as 
well as those of the other People of Innovation - will not 
benefit them until 
they repent from their innovation and return to the Sunnah." 
So Shaikh Rabee' said: 
    
"We describe them with whatever the Messenger  (sallallaahu alayhi wasallam)  
described them 
    with and we remain cautious of them and we caution against 
them - in fact we 
    caution against all the People of Innovation and to every 
caller to 
    innovation. But from where did you get this generalisation 
that the People 
    of Innovation do not benefit from their jihaad or their 
actions such as 
    prayer, zakah, fasting, hajj, umrah, good conduct (birr), 
maintaining the 
    ties of kinship, sacrificing wealth and oneself in jihaad - 
until they 
    repent? And which of the Scholars of Islaam have understood 
this? 
    
It is disbelief (kufr) which nullifies actions and 
obedience does not 
    benefit alongside disbelief. As for innovation, then it is 
not like that for 
    it is the innovation itself which is rejected and which is 
not accepted from 
    him - but it does not nullify all of his actions so long as 
he remains a 
    Muslim - not leaving the fold of Islaam or Eemaan. 
    
Do you not know that you have attached yourself to the 
way of the 
    Khawaarij with this ignorant viewpoint which clashes with 
the Book and the 
    Sunnah and the methodology of the Salaf us-Saalih. It is by 
this exaggerated 
    view that the Khawaarij became the most evil of creation and 
with this 
    oppression and extremism in their view regarding sins did 
they become 
    Khawaarij. 
    
And the intelligent person will find the workings of this 
man really 
    strange- that he is very severe against the Khawaarij and 
then you see him 
    wallowing in their ways - may Allaah destroy ignorance and 
the desire." 
    (Majaazifaat al-Haddaad - The Rashness of al-Haddaad p.104)
After this quotation I can't say any more than: "When you 
have no shame, 
then do as you wish"