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Swinson is being pragmatic, Corbyn is being ideological.
Immediately rejecting the only option supported by constitutional convention wasn't pragmatic. The monarch is tightly bound by these conventions. The country has been kidnapped by ideologues who will happily destroy all of that. The route out of that hole isn't yet more of the same; short of a full-on revolution, it relies on the monarch being offered a conventionally-acceptable life raft.
We may already be in the place where there isn't enough support for those conventions - either in Parliament or the country at large - to be maintained, but that kind of revolution clearly wasn't Swinson's motivation.
itsbruce-
Immediately rejecting the only option supported by constitutional convention
Could you provide some evidence for this? There is no constitutional convention that says the leader of a GNU should be the leader of the opposition and plenty (particularly within the 20th century) to say that it usually isn't.
ReekBlefs
Of course they're not. Swinson is being pragmatic, Corbyn is being ideological.