很不幸，在日常生活中疼痛虽然令人很不悦但却是必不可少的。疼痛会警告人们那些可能会伤害到自己的事物来保护他们。 （根据原文的意思疼痛是生活的必需品的而不是避免的，也就是说疼痛本来是对人有很多好处的，你的翻译意思上有点不对。）

PAIN, unfortunately, is a horrible necessity of life. It protects people by alerting them to things that might injure them.

youdao

但是，在我们积极地保护儿童避免这种伤害的过程中，我们必须确保，这部原先是为他们的利益而制定的法律，没有充当进一步伤害他们的工具。

But in our zeal to protect children from such dangers, we must ensure that we don't use the law, which was enacted for their benefit, to victimize them further.

youdao

我们为了保护自己不受伤害而建立起了围墙，然而那些我们想要避免的伤害并非来自外界，而是来自内心。

We put up walls to protect our selves from the hurt, but the hurt we are avoiding isn't outside ourselves, it's inside.

youdao