Sorry but you cannot generalize. Let me make something clear, there is bitcoin and there is cryptocurrency.

Yes, Bitcoin is safe though volatile but safe. But I cannot answer a yes or know to other cryptocurrencies. One moment they are close to the moon and someone is investing monies he cannot afford to lose, then next moment, it price drops to below a cent and the person's life's savings is down the drain.

This can never happen in bitcoin. Other cryptocurrencies are just copycats. They can never be the real deal.