Almost everyone assumes that trading a short and fastest means to make money (well it looks that way), but the reality you'll only get to know when you get involved. For many the long term endeavour towards making profit is embedded in investment alone but little did they think or know that for you to be a successful trader it's not an overnight attainment but years of consistency (building blocks on your failures and experiences) and hardwork on yourself by learning and relearning...
What we think at the beginning before knowing trading, will definitely have the same thoughts, so I agree with you. We think we can get profit quickly, even though the reality is not like that and even more difficult than what we imagine.
but after we know and are in it, we understand what is happening here. And usually some people continue and some choose to stop and not infrequently say something negative, such as trading is a scam and so on, that is something I often hear from those who fail and choose to stop.