If you are talking about the actual wording of the Bill of Rights, it certainly does not go too far in protecting the rights of the accused. After all, the Bill of Rights itself has fairly vague language that hardly anyone could dislike. For example, the 4th Amendment says that people should be protected against "unreasonable searches and seizures." You can't argue against that idea.
If you are talking about the decisions that the courts have made about what the Bill of Rights protections mean, then you have more of an argument. For example, should the exclusionary rule be kept? Is it right for someone who is guilty to go free because the police broke a rule in looking for evidence?
To write an essay like this, I would recommend that you look at a few specific cases or rules and say whether you think the courts have gone too far in those specific cases. Otherwise, you do not have enough concrete facts to talk about and you will just be talking in vague generalities.