I just see the presence of a democratic system as a safeguard against tyranny. Generally, I don't need to vote. But if a threat does arise, say, the BNP, then people could mobilise and make sure they don't get in. Simply the threat of having this mass mobilisation of voters is enough to prevent the fringe elements from getting into power, without having to actually exercise the right to vote.

In other words, if I feel the need to vote, the option is there, and knowing that alone should be enough to keep the politicians in line.