This is a good point. If someone is going to highlight what a federal tax cut does, they have to go to people actually paying federal taxes. Most people in lower incomes brackets already pay near 0 in federal tax. This is why tax cuts do not really help those who need help the most. To help those who really need help we have to spend money on things like healthcare, education, and jobs programs[1].
[1] As an aside, people rightfully rip on military spending waste a lot, but it is still a decently functioning jobs program.