Forced attack lets you attack party members.

[Mayama]

I dont know if its a bug but a+left mouse lets you attack your own party members, a character can even attack himself that way.

 

Edit: Tapping A two times gives you a sword courser and lets you attack party members, its not a+left mouse

 

Ok you can also kill NPC's this way, without even entering combat mode. Tested it on some villagers, they die, drop some loot, the death animation plays and than they just stand their for some seconds bevor disappearing completly.

 

Attacking guards this way turns everyone hostile towards you.

 

Quest givers turn hostile too, it seems random if the rest of the village turns hostile or not.

Edited August 23, 2014 by Mayama

[mrmonocle]

You could force attack party members in IE games.

[Gleipnir]

My party will kill EVERYONE! MOHAHAHAHA!

[Osvir]

You can force attack yourself in Pillars of Eternity. Should still be in as a design decision in my opinion, they could make a spell effect/trigger to make the player character attack him/herself (Confusion/Fear/Horror/CriticalMiss).

Edited August 23, 2014 by Osvir

[Marceror]

Not a bug in my opinion. Especially when you might come to hate one of your companions and want to kill them!