I have shares and you only lose money if you decide to sell the shares now - price might recover if you hold on to them and if you believe in Tesla's mission and value you might even think it's a good time to buy some more. (This is not financial advice)
But like I mentioned, I said he shouldn't have tweeted that message and should have consulted with his business partners first. I think he just wasn't thinking clearly of the consequences along with his other rather eratic tweets. I blame his lack of sleep and taking stuff like ambien...
I don't think he is a scammer and is all about making money. If you follow his history - he's an engineer and he wants to solve tough problems and wants to add value (see recent interview with Joe Rogan). What I would have liked to see more though is him mentioning his team and the brilliant people working at his companies.
To your last point (paraphrased):
> How is space technology moving humanity forward?
SpaceX is about space technology and that technology can improve life here on Earth - see:
http://www.esa.int/Our_Activities/Space_Engineering_Technolo...
https://www.nasa.gov/centers/johnson/pdf/167752main_FS_Spino...
And there is nothing wrong with trying to find or create outer space habitats. We can improve life on Earth and build rockets at the same time, i.e. we have enough resources and minds to work on all these problems.
https://www.telegraph.co.uk/news/science/space/7935505/Steph...
Edit: typos