Guilt?

I just had an intereting conversation with my co-worker.

She said 'animals are cute because they are innocent. Who has guilty is only grown human'

I asked her 'does children has guilty?'

She said no.

I said 'but how about this case? Children can be very cruel sometimes. I used to picking out bugs legs when i was kid'

She said 'that is cute'

Hm. Oh, really?

She said 'but when children do something wrong is wrong. Taking drugs are guilty'

Okay, i'm confused. And i asked her what's the difference?

She said 'drugs are bad. Right? But picking out the legs are... yes, its cruel.. but it can be cute somehow. .....'
She's confused too.

And she asked me
"How old do you think to start having guilty?'

Gurh i've no idea.
Because i think they are all guilty from he beggining.