Suppose there occurs some horrendous incident of roadway carnage. Nobody says, 'We need traffic laws.' Nobody competent in English says that because it conversationally implies that there are no traffic laws. What a person might sensibly say is that we need additional traffic laws, for example, laws outlawing texting while driving.
So why do liberals reliably say, whenever there is a school shooting, or a similar outrage, 'We need gun control'? 'Gun control' refers to gun control laws of which there are many at the Federal, State, and local levels. Why would a liberal say we need gun control when it is obvious that there is plenty of gun control?
Because, for a 'liberal,' 'gun control is code for 'gun confiscation.' It is just that they, or most of them, lack the intellectual honesty to state plainly what they are for.
One of the reasons Hillary lost to the unlikely Donald Trump is because of her mendacity on this very issue. A stealth ideologue to the core, her speeches were nothing but bromides, blather, and bushwa bereft of ideas and concrete proposals. She dared not say what she really had in mind in prosecution of Obama's destructive project of "fundamental transformation." Luckily, the Clinton dynasty is at an end as is the Bush dynasty. We can thank Trump for having put paid to both.