Honestly, even if I were to regard the way this thread comes across as unintentional harm, it's still toxic. That said, I don't believe it was accidental or incidental in the slightest. I agree completely with @digitalvalium1 on the issue: if there's a problematic icon, hey, idea! Let staff know, since apparently they're really invested in censorship lately.
BL works are currently, for whatever reason, a polarizing issue on the forums. Censorship, perhaps more understandably, is also a hot issue. Bringing them up, especially in a way that seems to be primarily to unite people against others, whether you name specific names or not, is at best what we would call SKY when I worked in Japan. That means Super Kuuki Yomenai, or "super cannot read the atmosphere", clueless as to the tone of the conversation of a group of people and what might be a bad topic to bring up.
Nudity is not porn. Censored nudity is certainly not porn. Kisses are not porn. And it speaks more on the viewer whose imagination is directly to blame for what they take from a tiny image featuring a small amount of censored nudity. It's an icon, 300x300. If you can manage to get much at all in that space, then congratulations because it's not exactly conducive to detail. The icon is how authors can advertise their comics and catch eyes, which is important since Tapastic's genre system is abysmal and the site overall is not particularly friendly to discovery of new series. In any case, I frankly would rather an author be honest about the points of appeal of their series than to mislead a potential reader.
It's not reasonable or innocuous to attempt to galvanize people for censorship, and to be honest the original post here reads as insanely condescending and insulting. You don't exactly have to reach to feel the mocking tone and derisive laughter, especially since it's written into the post. Using polarizing language like accusing someone of "harming" others -- with a tiny icon! -- is also far from innocent.
If you don't want your siblings to see the site, there's a simple solution: don't introduce them to the site. You can't control every aspect of another person's life, though, and it might actually be better to, as @digitalvalium1 also pointed out, take a more active interest in their lives. It's far better to explain things than it is to simply try to hide it from them and constantly try to micromanage what they see and don't see. And since NSFW work is allowed on Tapastic, it's certainly irrelevant to the site that you don't like certain types of content or think the site is "friendly" to younger audiences. This is not an all-ages site. Adults shouldn't have to feel obligated to hide or to dumb down every single aspect of their lives and interests, just because someone who made the choice to have a child doesn't want to actually do their job as a parent.
All aspects of the world are not going to be kid-friendly or the problematic "family-friendly", and they shouldn't be. There are plenty of spaces made specifically for younger audiences. Adult-friendly audiences are far fewer in number and typically face no end of aggro from people who seem simply to resent that they exist at all.
Please, if we could, lay off complaining about BL, especially if -- as was claimed -- that wasn't the intention. I'd also appreciate laying off the playing administrator by people who aren't. This is just stirring up people, and not harmlessly. If any of you were unfortunate enough to be at Y!Gallery, I don't even have to go into detail about why it's a terrible idea to do things like this. It just turns people against each other and fosters the exact opposite of a healthy community.