Helium 3 is for fusion, not fission. Obama cancelled the Constellation Mars mission in favour of the Space Launch System architecture which has no specific mission in mind (see the Space Shuttle for why that's a bad idea). Mars is not pointless. It's very important that we actually colonise it, but even ignoring that…

He didn't fly too high, he flew _too close to the Sun_. Given Daedalus' mission is to fly _away_ from the Sun, I don't see a problem.

Now you're just shifting goalposts.