It's not so much the strength of preferences that determines who votes, as much as who is systematically discouraged from voting.
The strength of preferences does play a significant part in voter turnout. Politically radical groups are more likely to vote and encourage people with similar but more moderate political views to vote.
The voter turnout of minority groups depend on the strength of their views, as any restrictions made to discourage them from voting complicate the voting process but don't make it impossible for most. Therefore, the strength of political views determines voter turnout for all electorate.
The strength of preferences does play a significant part in voter turnout. Politically radical groups are more likely to vote and encourage people with similar but more moderate political views to vote.
The voter turnout of minority groups depend on the strength of their views, as any restrictions made to discourage them from voting complicate the voting process but don't make it impossible for most. Therefore, the strength of political views determines voter turnout for all electorate.