responsibility is not about blame/accusation.. its about duty of having to deal with/control something/someone

responsibility is on the custodian(key holder/parent)

if its your private keys its your funds. you are responsible for DYOR to learn about the recipient. learn if they can be trusted. and find out who/where/what they are
if you put your funds/kids into someone elses custody. you have not absolved yourself of responsibility but now there are twice as many precautions you have to keep an eye on. and they then have responsibility of their own as well to look after whatever is in their custody

so dont just ignorantly trust them. research them.. because if they wrong you. you have a location and name to identify them to seek justice.
but keep in mind.. prevention is better than after-action.

it does not mean you caused it to happen(bad guys will be bad guys).
but lowering your own precautions will cause things to more than likely happen

even if you do everything possible. and bad things still happen. then at least I hope you have taken responsible actions to limit the risk of them getting away with it.

as for children/kidnapping and rape
when they are in proximity to you. your 100% responsible
when they are not nearby. you still have to have precautions to know where they are going. to teach them what to avoid. to trust they wont get themselves into harms way.
this is not about blaming anyone when it goes wrong. this is about being responsible to prepare and take care to reduce/avoid the risk of it happening.

its not blaming you for causing it after it happens. after all you didnt hire a kidnapper to kidnap
its about taking responsibility to reduce the risk before it happens. to prevent it happening

over-sexualised people will always do what they do. thats not your fault
just reduce the risk of its occurances affecting you or your family.
and if it still happens.. its on the rapist/kidnapper as the person to blame.