Because people are immature
Answer:
The difference between a revocable and irrevocable trust would be; A revocable living trust becomes irrevocable when the grantor dies because he's no longer available to make changes to it. But a revocable trust can be designed to break into separate irrevocable trusts at the time of the grantor's death for the benefit of children or other beneficiaries.
The 6th amendment gives the accused an impartial jury.