Hmm seems you've already got many reasons given by the community and if you still haven't made up your mind I think then you are not fit for the Bitcoin community.
From the very beginning, he was not a good fit for bitcoin. He knew about bitcoin through his friends, but instead of learning about it himself, he came up here asking people to give him a compelling reason to invest. I am wondering, is investing in bitcoin good for him or for us? So for someone who is always doubtful and lazy, spending time giving them advice is a waste of time.
If he has done his research before but still has some questions, that is greatly appreciated and we should take the time to explain it to him.