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Totally. Loads of people I know voted green because they couldn't stomach labour or (correctly) knew their vote was meaningless, so wanted to boost the progressive vote proportion. And I'm sure loads of tories stayed at home (as you suggested). People are likely fatigued by all the politics and are dropping out. And perhaps there's a cohort of young people who didn't engage because there was no one for them to engage with. Loads of options.
Key thing - as you said - is that it's not clear cut. Blame voters at your peril.
^ and that too!
Something I hadn't considered before posting that, which Dorian Linskey mentioned on OGWN, is that the certainty of a Labour victory gave people licence to vote in certain ways. Also that you'll have people who say voted lib dem (and may well support lib dem) who were happy with having Starmer as PM.
All in, as with PR counter-factuals, it's incredibly hard to make accurate what ifs.