Welcome back Isa, you were missed.
In Dylan's case, the only question I have is whether or not his lyrics work without the music. I'd say yes, but, since de gustibus non est disputandum, others might say no. In Pindar's case, arguably the greatest of lyrical poets, we have lost the music to his poems: for all we know he was a greater musician than Bach, Mozart, Schubert and Dylan put together. Judging by the volume of Pindar's reported works, performances of his work were in great demand, and the complexity of his surviving lyrics suggests that they could not have been the whole basis of this popularity. And yet, Pindar's poems, music-less as they stand, are still extraordinary.
ἐπάμεροι· τί δέ τις; τί δ᾿ οὔ τις; σκιᾶς ὄναρ
ἄνθρωπος. ἀλλ᾿ ὅταν αἴγλα διόσδοτος ἔλθῃ,
λαμπρὸν φέγγος ἔπεστιν ἀνδρῶν καὶ μείλιχος αἰών.
Ephemeral beings, humans, are they a be or a not be? ; dreams shadows
And yet, when god-sent splendor comes upon them
Brilliant lights shine, and so do their lives, serene.
As for Churchill, while admitting his literary merits, he not only held some "detestable views", he enacted detestable policies based upon those views. In general I don't have a big problem with writers having disgusting and/or prejudiced opinions, as long as those opinions don't provide active support for evil actions.
To take this point to its extreme, consider Mao: a handful of his poems (read in English translation, so I might be wrong) are a lot better than Churchill's speeches. If Mao really wrote those, he was a great, great poet. The little red book of Chairman Mao's quotes, was possibly the most printed secular book of all time. Millions were coerced to learn it by heart. And yet, considering some of Mao's actions and policies, had he been awarded a Literature Nobel Prize (don't laugh, weirder things have happened, I mean, Kissinger won the Nobel Peace Prize), it would have been a terrible mistake.