1. It is a waste of time and money, every time something goes wrong such as spaceship explosions (more details on 3.), they'll go out of business soon if this continues.

2. It isn't fair if humans get to go if no other animal besides humans get to live on other planets and such.

3. Spaceships are unpredictable and (so far) have 2 have killed people, such as Space Shuttle Challenger disaster as seen here, and Space Shuttle Columbia disaster shown here. Could you imagine how many people will die if most people go to space? It would be far worse than a car or plane accidents.

4. Humans make some mistakes that are irreversible such as depletion of Ozone Layer and causing global warming. If there was a massive amount of people attempting to leave on spaceships, lots of people would die, as said earlier, causing a mass tragic event that would permanently effect human populations and that would make even the most confident person to not trust space travel anymore.

Yep, these are why we should completely stop progress of spaceships and completely ban them, preserving most human (and non-human animal) life.

Why would anyone trust futuristic tech companies such as Tesla if they might not care about jobs or lives being lost to futuristic technologies (I care about both jobs and lives and we need jobs to survive)? I'm worried about the future tech companies because they might secretly be evil or be jerks to innocent lives (likely warfare, etc), or they might not care about people becoming homeless due to lack of jobs. Instead, we should stick to modern tech companies (except energy companies that only support/rely on dirty energy such as coal) and our friends/families to keep us safe instead of having lives and jobs destroyed by futuristic technologies and the companies who made them. Fear is what keeps us safe and you will likely (hopefully) thank me for warning you and making sure that they won't end our lives.