Liberal and liberty have the same root — libre — freedom. There’s nothing in the word itself that is inherent about individual freedoms versus collective freedoms. Balancing the responsibilities and liberties of the individual versus the group has been in tension for as long as society has existed. Japan in particular tends to prioritize group needs over individual. You just pulled most of that shit directly from your ass.
Now to answer the actual fucking question: Japanese culture tends to prioritize stability, seniority, and lineage — as such Japan is essentially a one party democracy — and history has settled on the LDP for that. If you actually want to be in government then you need to join the LDP. For the minor interludes where a non LDP party was able to build a governing coalition, it has generally been considered a mistake by the electorate.
While on the surface the LDP governs, the LDP itself is *highly * factional. When Japanese PMs resign they’re usually pressured from within the LDP and replaced from within the LDP itself. And though the LDP are usually the leading party, they often require a coalition with other right wing parties. Those parties effectively act as cadet LDP factions.
While in the US you have only two highly monolithic parties, in Japan you have one very fractured party, and bunch of right wing partners. The LDP is right of center, but in Japanese politics it’s about as left as government gets. The Japanese themselves value stability, conformity, and the collective good. Post WW2 the US was afraid of communism in Japan and did a lot to maintain a center right establishment. In the 1970s the far left did a lot delegitimize themselves.
You can’t convince me this and the trump shooter aren’t right wing gambits.