Why does a murderer with serious circumstances have a lawyer to defend him?

Many people will feel confused when reading some criminal cases. Why can a murderer with a very serious case hire a defense lawyer? What can these lawyers defend the murderer? In fact, these are all stipulated by our laws, because everyone has the right to defend himself. Even a murderer with serious circumstances can only be regarded as a criminal suspect before the final judgment. Therefore, both the plaintiff and the defendant can hire lawyers. If there is no condition to hire a defense lawyer, then the legal aid agency will appoint a lawyer to defend them. ?

Lawyers are very important in a case, because many parties are not very familiar with the law, so lawyers must consult the case materials and state the case to the judge at this time. Moreover, many cases are full of doubts now. Sometimes, suspects can't admit their crimes at the first time. At this time, defense lawyers need to collect information and find more evidence for their defense to prove their innocence. If the defendant is really wronged, then lawyers should actively seek evidence and actively defend the defendant in court, which can also be regarded as helping innocent people get out of this lawsuit. ?

Because there are still many unjust, false and wrong cases, many criminal suspects will feel wronged or framed in court. But because I haven't experienced such a thing, and I don't have a certain reserve of legal knowledge, I can't defend myself well in court, so I need a lawyer to testify for myself, collect evidence and state something for myself at this time.

Because lawyers have the right to read the relevant files and some related materials, but the parties do not have this right, so in order to make the case go smoothly, lawyers also play a very important role. If the defendant can take the initiative to admit murder, it must be a happy thing. If the defendant denies the murder and finds some evidence of himself, then the lawyer must defend him at this time. If there is evidence that the defendant is innocent, then the plaintiff cannot be convicted.