Anarchy is conservative

There is no reason to think that voters who oppose the left are more likely to vote for the Tories or a party of the right if they have only fptp. There is no reason to think that by (apparently) reducing the choice for right-wing voters they will be more loyal to the right. Since socialism is progressive then that which opposes it (democracy) is conservative and then more democratic systems such as pr are more conservative than less democratic systems.

Proportional representation (like direct democracy) is more conservative than first-past-the-post because it makes things more difficult for those in power. To give power to the people is conservative since the people themselves are conservative.