Look, the Brennan Center article is technically correct that federal law prohibits armed agents from being inside polling places to interfere with voting. Cool, we get that. But that doesn't erase the broader risk. Legal prohibition doesn't stop an ambiguous presence. ICE or other federal agents can be right outside, visible, intimidating voters, and people will feel fear even if no one technically crosses a line.
The point isn't about "oh no, are they breaking the law?" It's that this administration thrives on chaos, fear, and delegitimizing elections. Trump's rhetoric about stolen elections, "illegals voting," canceling midterms, all of it, is building a climate where normal legal protections may not feel real in practice. This is further back up by SCOTUS and congress letting him do what he wants.
Why do you dudes love trying to dilute any kind of concern raised about this administration? We saw this same thing before the last election, where people called every concern "fearmonger," and now look. We were right. He has built an ecosystem of intimidation and the risk that comes with it is real, even if you don't want to admit it.