Lord stops progress of demoniac activites

The impious and the nondevotees are against the principles of the Vedas, and so such persons are always hampered from making advances in their nefarious activities. Some of them, who are specially favored by the Lord, are killed by Him personally, as in the cases of Ravana, Hiraṇyakaśipu and Kamsa, and thus such demons get salvation and are thereby checked from further progress in their demoniac activities. Just like a kind father, either in His favor upon the devotees or His punishment of the demons He is ever kind to everyone because He is the complete existence for all individual existence.

(Source: SB 2.4.13 - Purport)