Why do liberals and conservatives tend to use the same words to mean different things?

Liberals tend not to have children - or at least enough to replace themselves - and yet the British population is still growing.

Liberals, on the other hand, do not tend to see themselves as representatives for any ideological movement.

At previous elections the Liberals had tended to gain support during the campaign: in 1987 this did not happen.

Liberals tend to live in more economically productive states than conservatives.

Liberals tend to write measured books, going out of the way to give the devil his due.

Yet liberals have tended to stay apart from the fray rather than engaging in it.

Where liberals tend to think of collective responsibility, conservative Christians focus on personal morality.

Do all liberals tend to cultivate the commons instead of their own gardens?

This is why liberals tend to deny His existence.