How has he became so famous? Should they be famous? Why?

One reason Ned Kelly became famous was when he would town hostage at Glen Rowan. Ned Kelly was known to be an Australian Bush ranger helping out the poor (which is a myth). Wearing famous Armour the Kelly brothers held a shoot out with police. Several hostages were killed and 2 later died from gunshot wounds.

I believe that Ned Kelly shouldn't be as famous as he is because he is a criminal and performed dirty, rotten deeds which got himself killed.