Madeline: Science denial really grinds my metaphorical gears, and Flat Earthers are some of the most egregious about it. So manhandle them into strait jackets and shove them in the damn rocket already.
The other problem is that it's a slippery slope. Theoretically whoever would be in control of essentially killing these people would be the ones who make the final decision on who those people actually are.
With that level of power corruption will be unavoidable and people that are not even actually flat earthers will die as well due to their deaths being convenient in unrelated ways for the group that decides which flat earthers get jettisoned into space. I don't think anyone should have that power, humanity has more than proven by now that placing people into positions of that much power never works out squeaky clean.