No one seeks or supplicates for evil, knowing that it is from evil, but many human beings seek and supplicate and try to get something which is in fact bad and evils for them but they do not know that at that time. That is why we read in the next sentence in the same verse : Human being is hasty.
Hasty desires are bad and can lead man to evil with out his knowledge. Man needs to think properly before seeking anything and ponder on the possible sequences. A narration from Imam Jafar Al-Sadiq (AS) says: "Distinguish the way which saves you from the way which destroys you, so that you should never seek what can destroy you thinking that is will save you. Allah (SWT) says: Man seeks evil as he seeks good, and the man is hasty." Tafseer Al-Amthal, V. 8, P.418.

Wassalam.