Translation of "Idiots" in Chinese

Smokers are a bunch of idiots.

烟民都是一群傻瓜。

Who are the idiots who said that teachers should push for larger amounts of homework, seeing as the students don't work enough?

说因为学生不够努力，老师应该布置更多回家作业的傻瓜是谁？

The fundamental cause of the problem is that in the modern world, idiots are full of confidence, while the intelligent are full of doubt.

问题的根源是，在当今世界，愚人充满了自信，而智者充满了怀疑。

- The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.
- The fundamental cause of the problem is that in the modern world, idiots are full of confidence, while the intelligent are full of doubt.

问题的根源是，在现代世界中，愚蠢总是伴随着过分的自信，而睿智则总是伴随着谨慎。