Please explain the meaning of the sentence
You should supply more context.

有时候 Sometimes 灭掉 eliminate/destroy 不如 not as good as 引导 lead/guide。

In a political context maybe:

It is better not to seek to destroy your adversaries but to guide them.

Or if the context is bad habits:

It is better to seek guidance rather than try (yourself) to eradicate a bad habit.