sometimes that's just the way things work
I can't name one well known disease (outside of STI's and some cancers, obviously.), that hasn't been cured by vaccination or injections? STI's, AIDS, and HIV are the only ones I know, pretty much everything is cured in some way, or CLOSE ENOUGH to might as well be cured. Mebe I'm missing something tho, but human body's are easily adaptable and can eventually overcome anything, and with enough research and a breakthrough or two, it's only time.
You're basically saying that you don't think we'll never ever have contact with aliens. It's only a matter of time. Maybe it won't happen next year, or 5 years from now, or 10 years from now, or 100 years from now, or hell, even 1,000 years from now, but eventually it is bound to. This is still a really important step towards that, but it's going to happen some time, it's just a matter of when that time is.