2 Peter 2:12

‘But these, as creatures without reason, born mere animals to be taken (captured) and destroyed, railing in matters of which they are ignorant, will in their destroying surely be destroyed.'

In their pride they do not recognise the truth about themselves. They are behaving irrationally. They are forgetting that because they have ignored the Spirit and rather pander to the flesh (see Galatians 5:16) they are nothing better than animals. Having turned their backs on a true relationship with God, they are like wild beasts (compare Daniel 7:3; Daniel 8:2 ff; Revelation 13:1), and they will thus share the inevitable fate of such animals, they will be captured and destroyed. Evil angels/spirits do not play games.

And yet although being nothing better than animals they think that they can mess with heavenly powers. What folly. There may here be the thought that they call on the occult in order to destroy the lives of those who displease them, ‘railing (blaspheming) in matters of which they are ignorant --- destroying'. Or it may indicate that they think that by their own spiritual prowess they can consign ‘demons' to the pit. Either way the consequence is that they will be destroyed themselves (compare Acts 19:13).

Note that Peter uses the idea of ‘speaking evil, blaspheming' three times. ‘Speaking evil of (blaspheming) dignities' (2 Peter 2:10); bringing ‘a blasphemous charge' (2 Peter 2:11); and here ‘speaking evil/blaspheming in matters of which they are ignorant'. They are the very opposite of righteous. They are being blasphemous in the way that they behave towards heavenly beings (like the angels that fell they too are not keeping to their position - Jude 1:6)