This is necessary for human progress. Gutenberg with this idea that will make the investors rich. Colombus stands up and says: I am going to the Indies across the Atlantic, it is going to be easy! Or Magallanes crossing the world, or going to the moon, Knuth creating Latex or the AoCP as a "semester" project, Artificial intelligence would be solved in 10 years...
In the end Gutenberg almost bankrupted his inventors and died penniless, Colombus faced riots and almost starved, most of the Magallanes' crew perished, going to the moon took so much more money, Knuth project took his entire life...
But the courage paid off for society as a whole because they got involved and took responsibility and risk on their lives.
It has always been easier to criticize and risk zero, while cynically putting all progress down.
Tesla or Elon is not perfect, but no human being is, if you wait for something new to be perfect before is ready, then you will never get it.
Progress is not automatic, needs people that believe on it, probably even delusional people.