Please help: does my almost 4 yo need a child psychologist?

[LittleOneMum]

Hello and thanks in advance for your help. I am currently on holiday in France and am typing away on my phone, so sorry for typos.
I have a bright 3 year old DS, he is 4 in a few weeks. I also have a 15 month old DD. Today my DH watched in absolute horror as my DS quite deliberately pushed my DD into the deep end of the pool, where she was kneeling to touch the water. Luckily my DH was very close (we have watched them like hawks near the pool) but she still fell in, my DH had to dive in and get her and had to be pulled out from about half way down. She was fine, just got a fright and was only in the water a matter of seconds. I am very glad I did not witness it ( I was in the loo) but my poor husband is still shaking now, hours later.
The question is - what to do? We had a very big chat with him about swimming pool dangers when we arrived and he is bright enough to understand. Not completely but enough. My DH has confiscated all his toys and said that he has to earn them back.
But this was hideous. Apparently he walked up from a few feet away and quite deliberately pushed her in. No context, no reason.
We are now sitting here thinking the worst about him: if someone else had find it to my DD I would think the child was seriously disturbed.

Child psychologist? Any other tips? DH is saying we should go home a week early. I should also say we have now covered up the pool.

Sorry, the first sentence was about the baby, the rest about your other child. The baby should not been by the deep end of the pool in the first place. I would not look to blame the 3 year old, but the adult looking after both children.

Agree with all the above. The only thing I am a bit horrified about is anyone letting a 15-m-o lean down to touch the water in the deep end without holding on to her very, very, very tightly. I dare say your DH is really cross with himself.

My DS is much older than yours, and still does horrible things to his younger sister. He still hasn't quite grasped the action - consequence thing (if you push your sister out of a tree, she might get hurt - that kind of thing). DH spends much less time with them, so is more readily shocked by averagely daft/unpleasant childish behaviour.