I was thinking from the perspective of society rather than from my own personal beliefs. For instance, I gamble at Primedice sometimes and have CLAMs invested at Just-Dice. Yet Primedice recently closed off access to its US-based users and Just-Dice abandoned BTC in response to Canadian gambling laws. Online gambling is outright illegal here in New Zealand so it's quite clear that the society that I live in doesn't approve of what I'm doing.
And I would say that gambling is still considered to be shady. It's just that "shadiness" is a spectrum with dice sites like PD on one end of the spectrum and assassination markets and terrorism on the other end. Drugs and pornography probably lie somewhere in the middle.
If you read news reports from mainstream news sites, then it's clear that they often lump all of those things together in order to make Bitcoin seem like something that is "underground":
Gambling, porn and drugs are not shady unless abused, like anything else. There is nothing morally wrong with doing any of them, however they are categorized as "sinful" from a religious perspective which has made its way into law. They are considered illegal or crimes in many places, to which there is no victim.
It's interesting to see that you mention Just-Dice and Canadian gambling laws. What's funny is that the we have lottery and gaming corporations in Canada run by the government. They are even able to market and encourage lottery and gaming to the mainstream through TV commercials, radio, internet ads, etc.