william macaskill professor philosophy at oxford university and the co-founder of the center of for effective altruism it's really great to have you with us today welcome to our show was. great to be here thank you for inviting me so all right so the movement here associated with is called a sect of altruism i mean the very notion of this active altruism makes me wonder can altruism bathe in affective or even harmful and in what cases yes i think suddenly. very often is ineffective or even harmful so there are many attempts where people try and do some out of good but actually end up. achieving very little or just achieving far less than they could have done so for example if so that i'm in the united states called scared straight takes juvenile delinquents and shows them around prisons in order to scare them out a life of crime but this has been studied many times over and actually it turns out that this program increases the rates of criminal activity among those teenagers in the years following the program so this is actually an example of an activity.