Why is foreign text "rendered meaningless" when passed through an online translation tool?

为什么外语原文通过在线工具翻译后就变得“毫无意义”了呢？

youdao

As a result, the laws could be rendered meaningless if international courts refuse to recognise them.

那么，结果很有可能是一经国际法庭的拒认，那么此法将会是毫无意义。

youdao

All these legal changes could be rendered meaningless by the financial excesses of the past few years.

这些法律上的变更在过去几年发生的金融巨变面前显得毫无意义。

youdao

Soon the new behemoth is scrambling for survival, its former success rendered meaningless in the new competitive landscape.

FORBES: Survival Instinct: Businesses Must Watch Out For Mother Nature

This exception is essential to the operation of the federal system itself, which would otherwise be rendered meaningless.

ECONOMIST: Gay marriage

"Unless we deal with global warming, all other protective measures for coral reefs will be rendered meaningless, " he said.

BBC: US vows 'huge' marine protection