RationalWiki article on Craig.

[Huggy Bear]

If that is your definition of a great leader then Charles Manson is a great leader...  Leading your followers astray is the very definition of a bad leader.

I think the word you're looking for is charismatic.

"Great":

Definition of great

1. 1a :  notably large in size :  huge all creatures [i]great and small[/i]b :  of a kind characterized by relative largeness —used in plant and animal names the [i]great horned owl[/i]c :  elaborate, ample [i]great detail[/i]
   
2. 2a :  large in number or measure :  numerous [i]great multitudes[/i]b :  predominant the [i]great majority[/i]
   
3. 3 :  remarkable in magnitude, degree, or effectiveness [i]great bloodshed[/i]
   
4. 4 :  full of emotion [i]great with anger[/i]
   
5. 5a :  eminent, distinguished a [i]great poet[/i]b :  chief or preeminent over others —often used in titles Lord [i]Great Chamberlain[/i]c :  aristocratic, grand [i]great ladies[/i]
   
6. 6 :  long continued a [i]great while[/i]
   
7. 7 :  principal, main a reception in the [i]great hall[/i]
   
8. 8 :  more remote in a family relationship by a single generation than a specified relative [i]great-grandfather[/i]
   
9. 9 :  markedly superior in character or quality; especially :  noble [i]great of soul[/i]
   
10. 10a :  remarkably skilled [i]great at tennis[/i]b :  marked by enthusiasm :  keen [i]great on science fiction[/i]
    
11. 11 —used as a generalized term of approval had a [i]great time[/i] it was just [i]great[/i]
    

greatness
noun

https://www.merriam-webster.com/dictionary/great

I would say that I was referring to #3 -- "charismatic bloodshed" does not seem like a very expressive term to me.  And, yes, Charles Manson was a "great leader", albeit, on a very small scale.

Obviously the word great is contextual, and somehow you managed to highlight every definition other than the one that applies to the context we're using...

10a :  remarkably skilled

Hitler WAS NOT a 'remarkably skilled' leader.