Let's begin with my internet filter settings:
Safe search --> ON
Adult content --> Forbidden
Alcohol, tobacco content --> Allowed
If I google search "whiskey" or "malboro" or "porn" under these settings, the outcome is always the same: KSK red light screen. So, even though I don't care about alcohol or tobacco content being displayed, it gets blocked anyway (from search queries).
Why? Because of the flawed functionality of Safe Search.
You see, safe search blocks content that belongs in the categories:
Adult content; Alcohol, tobacco, narcotics; Profanity, obscenity; Extremism, racism,
...and that overrides user's specific instructions.
Fun fact: If I, under the same settings, type www.absolut.com (vodka brand) in the address bar, the website obviously loads like a breeze. That's because this wasn't a search query AND because the alcohol content is allowed.
In my opinion, KSK should let users define what safe search means to them by letting them CHOOSE the search categories they wish to block. This shouldn't be so hard to materialize. I believe that safe search blockings are based on certain keywords, so it would only be a matter of categorizing them.