Because that is now the white power sign. That's reality now.
My point is very simple, and it goes for blogs, Twitter, Facebook, or bumper stickers on your truck: there's a lot of people out there who looking for the barest thing to fixate upon to get you in trouble, right down to a simple knuckle-crack.
I'll be blunt: I think it's very unlikely that your opinions on <insert current controversial topic> are going to revolutionize the status of the debate on that topic. The world has nothing to gain by you writing about that topic, and as you say, there's a chance you have something to lose. So just don't write about that. My advice if you want to maintain a blog is to write about something you care about and know about.
You can view my personal blog if you like, it's in my profile. I write about woodworking and video games and gardening. No one has tried to destroy my life for my experiences with growing grapevines. Sure, if I went off on a rant about <insert controversial topic> or wrote a bunch of hyper-negative invective about <insert group of people>, yeah that might come back to bite me. So I don't.
No one's going to come after you for a personal blog about playing guitar or whatever. Stay positive. Stay constructive. Stick to what you know. Don't invite controversy. You'll be fine, and maybe you'll even create something that touches someone else in a positive way.
https://www.nbcsandiego.com/news/local/sdge-worker-fired-ove...
There. It happened. In the real world. So cracking your knuckles is there under "inviting controversy."
Part one: You, me, the writer (any human being)
Part two: Existing in a public space (to be found via Google or or noticed in Twitter or making stuff on Etsy or showing things on Instagram or just being photographed in person)
Part three: Self-expression of any form (writing something that will be found "colonial," or a blog, or making a hand gesture, cracking one's knuckles, or standing there with an uncomfortable smile, or even knitting (https://unherd.com/2020/01/cast-out-how-knitting-fell-into-a...) in that public space
Part four: Negative consequence for that self-expression ("cancelled," getting fired, the usual death threats, "screaming, hats first into the wood chipper") from ... people who have never even met you, who found that self-expression in the public space.
Cardinal Richelieu: "If one would give me six lines written by the hand of the most honest man, I would find something in them to have him hanged."
It's the revolutionary spirit of the times. These incidents occur. You may not be aware of them, but others are aware of them, and they have what is known as a chilling effect.
Is the idea that the NBC San Diego branch just ... made this up? That the BBC (https://www.bbc.co.uk/programmes/m000d70h) fabricated this wholesale? Let's just click through some of those hyperlinks in the Unherd thing. https://fringeassociation.com/2019/01/07/2019-my-year-of-col... sure seems to have happened; take care to note "I've offended many people with this post, and for that I am deeply sorry. Please read my comment here. And 01.12 Please read my follow-up about what’s wrong with this post here."
These are all things that have occurred in "reality" and the "real world," to use your diction. You can now ignore them -- feel free! -- but pretending that they didn't happen is, I don't know, a performance only for yourself, because I cannot unsee what has been seen.
I am not terrified; as above, I pointed out that the potential negatives outweigh the possible benefits at this point. It's a simple analysis. You have elected not to factor those real world events into your analysis.
If your news diet is consumed by negative press and sad stories, they become more readily available[0] to you and can affect your decisions adversely by making you think that the base rate of such bad events are more common than they really are[1].
[0] https://en.wikipedia.org/wiki/Availability_heuristic [1] https://en.wikipedia.org/wiki/Base_rate_fallacy
It's a shame, semi-permanent communication now represents an attack surface for randos hoping for their free-floating rage to find a surface upon which it might condense. In a sense, this provides little benefit to you except as an outlet and perhaps as a way to exercise writing skills, learning about a blogging platform, perhaps SEO (or not!), and so forth, but now the possible benefits are outweighed by the potential negatives.
The future looks like a lot of people performing the "grey rock" method. It's a pity, but that's the system as it punishes and rewards today.