You are so right.
But, the sacrifices of the past are not the ones we take in modern times.
The risk of human life is on the top of the list.
It was a given in the day, and even in the 20th century. People were expected to die in order to accomplish the task.
The space shuttle cost so much to operate due to so much redundancy. Just think how far Christopher Columbus would have gotten if he had to have a “Mission control” watching his every move. And, the amount of redundancy in the Nina, the Pinta and the Santa Maria as the Shuttle has.
That is why you will never see a Panama canal built or another World Trade Center. At least in the USA.
Insurance, liability and financial gain is so high for so many. It is too cost prohibitive.
Ask not what your country can do for you, but what you can do for your country. Does not work any more. Unless it includes a Mansion over looking the Pacific Ocean.
I believe we save the earth first then go to space. Meaning manned space travel. Send all the probes you want. Send one to Uranus if you like. :-)
The sun is not expected to blow up for some time. The snail pace that we are going, exploring our own solar system, will not help us if something catastrophic were to happen. Even the people lucky enough to be in the space station or on the Moon would be SOL in no time.