But what person has only one aim?
There are people I think are best, people I think are good, people I
think are less good, people I think don't matter, and a person I think
is bad.
If I select the only best, if they do not have a good chance to win
then it creates a chance to let the bad in. If I select all but the
bad, I risk helping the less good win.
So the most desired result comes from picking only the good who are
likely to win. If I waste my selection on unlikely options then I am
not doing all I could to keep out the bad. If I vote for everyone
except the bad I am not expressing my preference for good.
What harm is there in voting for someone you think is good but you
don't think has any chance of winning? It doesn't stop you from being
able to vote for someone else - you can vote for as many people as you
like.
You should definitely vote for everyone you think would be good. The
only difficult bit is with the people you think would be ok. If there
is someone you think would be ok but not good, and they are the person
most likely to beat a person you think would be bad, then it might be
a good idea to vote for them in order to prevent the person you don't
like from winning (ie. lesser of two evils). So, in some
circumstances, it might be good to vote for someone you don't like
much, but there is never a reason not to vote for someone you do like.