Ideally, the Fed is fighting inflation rather than deflation. In those circumstances, interest rates are higher.
I get that interest rates are low. But the Fed has more than savers to think about. If they raise rates they will choke the economy and encourage deflation. That's what the EU has been trying and it is having the expected effect. Moribund growth, weak investment etc. A weak economy does no one any good.
The pickle the world economy has been in is serious and we haven't emerged from it yet. The US Fed has actually done a better job than most in protecting the US economy. But everyone has to bear some of the burden of the 2008 catastrophe. Savers included.
If the US congress had permitted infrastructure investment, the US would likely be in a better place. But it would have needed to borrow more.
The good news about low interest rates is that all sorts of projects are feasible that otherwise are not. But US policy-makers have ignored the opportunity because of "the public debt".
Personally, I think the US would have been better served by issuing another $1tn in debt and investing more in alternative energy, rail networks, cable networks and computer security. The sort of projects that deliver cash flows and other benefits in the long run. If you can borrow at 2% and return 5%, why wouldn't you do it?
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