My understanding of your argument is that a higher risk of accidents should require less regulation. That seems kinda nonsensical to me; if we have a problem with people shooting guns in the air, the answer isn't asking everyone to wear combat helmets all the time so they don't get hurt, it's to stop people from shooting guns in the air. Furthering that analogy, places with lower population (generally) don't have such laws, since it's less likely to hurt someone to the point of no longer being an issue.
Obviously there are no "laws" as such on the internets, but there is social stigma that can be applied.
1. This is the internet. If you run into a forum that triggers you, leave with your feelings intact. If everyone around you is firing guns into the air repeatedly, that is a lethal situation less easily escaped. If everyone owns guns that fired infinite bullets and firing aforementioned guns was the only human language left to mankind, getting mankind to stop shooting the guns would be - impossible. The better advice would be not to get everyone to stop shooting, but to make sure everyone has bulletproof skin.
2. We're a nice lil' village. Goes without saying. It's easy to tell everyone here that we should be mindful, because we already are. We already more or less have an identity assigned to each of our respective identies and avatars, we know what ticks the others off and avoid it. In greater communities this is impossible.
3. Ah, so we can socially exclude faceless people for offending others using words they should have to self-regulate in advance for fear that they will be socially stigmatized.
Might as well dam the victoria falls with a sponge for the crime of running for all the good it'll do you. If you want to become tumblr or reddit, do as you say. It kills free discussion when people are more afraid of sincerely telling what they mean in the only medium where they can actually do so.
I seem to recall you having a problem with people misunderstanding you and calling you sexist/etc. If I'm remembering that right, did you ever stop to consider your word choice might be contributing to that phenomenon?
I would always recommend to keep saying whatever especially in the face of those who would deem it sexist/racist/bigoted. This retreat of acceptable words and unacceptable words is what leads to the erosion of our language. What was acceptable 100 years ago sounded offensive, became offensive and disappeared. What's acceptable now will likewise disappear if we honestly go about witchhunts when someone dares to use the word 'creature.'