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RE: Colonizing the stars is the ultimate human endeavor that really matters.
We have a lot of problems to solve before we decide to send humans on interplanetary, or intergalactic travels. Radiation is a huge concern and a materials science issue at the moment.
I worked in aerospace and I saw how this is a problem first hand. I would feel much more confident if we advanced our technology enough, which includes materials science and novel methods of radiation blocking first before travel.
In that way we can protect humans and equipment from possible damage.
Yeah sure. We need to figure out a lot of technological challenges first before embanking on interstellar travel. That calls for more investments and research in space technology. This is should be our first order of business on our long term mission to colonize space. Artificial gravity, close to light speed travel, radiation as you've stated, space travel preparation procedures, health in space all this are challenges we need to deal with. May take some time but as long as it can be done, nothing should hold us back.