自行其是

I couldn't see the point of letting him have it his own way.

我不明白让他自行其有什么道理。

You’re a maverick and you’ll try anything.

你自行其的人, 样样事情都要尝试一下。

The committee was doing well until the chairman's independent action gummed up the work.

委员会的工作原进展得很顺利, 后主席自行其, 把事情弄糟了。