One of the many uses of 就 (jiù) is to add emphasis to indifference. This is similar to when we say in English "if you want to do it, then just do it!" and swapping out the "do" in that sentence for some other verb.
Verb + 就 + Verb
This structure will usually add emphasis to what are saying, and it often expresses that the speaker has an "I don't care" attitude.
Negative Adj. + 就 + Negative Adj.
You can also add in an adjective with a negative connotation. The use is the same here.