I can definitely appreciate this point, I suppose my personal experience of this, is not entirely dissimilar to the so called shy Tory phenomena that was mentioned awhile back. Where on the surface at least the differences between people of different party affiliations are not necessarily apparent and to some degree only partly representative of what someone actually believes.
Anecdotally I’ve not spoken to that many people who voted Tory who were that outspoken about their political opinions, which made me ponder whether many people who vote for mainstream parties are actually that politically engaged at all and as such unlikely to actually campaign for either party.