77 million voters voted for Trump after he'd shown them exactly who he was. I don't think you can blame the voter sentiments and information environment that leads to that outcome on the voting system.
A fragmented party system driven by Parliamentary coalition building might actually mean less accountability, since right-leaning independents and ex-Republicans disgruntled at the erosion of democratic and social norms under Trump suddenly have to worry about actual socialists being part of the alternative, and options that genuinely aren't MAGA to vote for who in practice will need to ally with MAGA
A fragmented party system driven by Parliamentary coalition building might actually mean less accountability, since right-leaning independents and ex-Republicans disgruntled at the erosion of democratic and social norms under Trump suddenly have to worry about actual socialists being part of the alternative, and options that genuinely aren't MAGA to vote for who in practice will need to ally with MAGA