When it comes to issues like superstition, abortion, gender, race, pseudoscience, consciousness, etc. so far everyone who disagrees with my views tends to demonstrate horrible illogical arguments or even a complete lack of justification for their views. This doesn't really apply to LWers, I'm talking about outside of this site.

How about people who agree with your views - how many of them have horrible illogical arguments or even a complete lack of justification?

LessWrong is heavily biased towards the kind of people who can articulate why exactly they believe something in a logical-sounding way, compared to people from a random internet forum or people one might meet in person. So maybe what you're seeing is just that a lot of people have horribly illogical justifications, it's just that the only time you have to listen to a justification for a belief is when you disagree with someone.

Conversations rarely go:

- I think homosexual marriage should be legal.
- I fully agree, but *why* do you believe that?
- Well, because <illogical and incoherent justification>

In terms of strength of the effect, I'd guess it's something like:

1) stupidity is correlated with both wrong opinions and bad justifications

2) you're more likely to encounter explanations for beliefs you disagree with

3) your judgement of which justifications are good or bad is biased by whether they support your beliefs