Comment by loeg

You appear to be based in the UK. Speech laws are very different in the US. It is a mistake to project your understanding of censorious UK speech laws on us.

Unlike the UK, expressing opinion is inherently legal here. What would be illegal is lying about specific facts, or expressing opinion based on secret facts you falsely claim to have. However, the standard for damaging a public figure, which Mangione certainly is, is very high -- Mangione would need to show "actual malice" (that is, that the speaker knew or should have known they were making false statements).