Of course investors need to do their DD, and investing is risky, if anything was a sure bet, everybody would take it.
The idea that I was trying to convey is that trying to accomplish something that is very hard, and doing it in good faith and doing your best, is admirable and the world needs more of that. If it was easy and success was assured, there would be nothing special about going for it and a million others would already be doing it, so you'd add very little value.