Ds is 4 and has been home 8 months. He has severe speech delay, though has made good progress in speaking and understanding. He also has other delays. His behaviour has been challenging from day 1 (of intros!) but we have been really firm and consistent and he behaves so much better now. He is a really happy energetic little boy and seems really settled. However, he is going through a really destructive phase and has broken lots of his favourite toys and books. Sometimes he just picks one up and says 'break it? No.' or 'tear it? No.' , other times he has a manic laugh while breaking things, and other times he just quietly goes off and breaks things. Yesterday his sw brought him 2 new toys and he loved them both. However he had thrown one across the room even before she left. The other was played with all day but then in the evening he quietly tore it to pieces. We've tried talking to him, but it's not clear what he understands ( though he knows it's wrong) and he certainly can't explain why he does it. We've tried being cross. I've tried throwing the broken toys away in front of him but he just shrugs. Today I tidied a lot of his toys away and left him with th broken ones (he snapped all the track of a train set today) in an attempt to make him see a negative impact of his behaviour. But now I feel cruel. Does anyone have any experience of this or advice as I just don't know how to get him to look after and stop destroying his things. Thank you.