I like this attitude of fearless playfulness. Seems to be something about the Epicurean perspective that brings out this feeling.
Yes. I think it's very important. It's like Lucretius is warning about, we're up against a veritable army of nay-sayers and manipulators, and you need an upbeat and even devil-may-care attitude to stand up to what's coming up against you.
And two paraphrase of one of many relevant quotes would be that there can be nothing terrible in living for the person who knows that there is nothing terrible in not living -- and that you can be confident due to what's wrapped up in the allusion that it is always possible to "leave the theatre when the play ceases to please us" -- of course most of us are lucky today that the play generally doesn't get that bad.