So, is "magnetic paint" actually a thing, or do we need drywall with Faraday cages?
The more people using secure approaches the less suspicious it is to be secure. Especially if there is a sensationalist justification - fight dirty in turn and use their weapons of fear as a pretext against them.
Which reminds me of resistance to a minor driver tagging law in New Jersey. Parents were outright defying it and refusing to pay for the stickers and just covering the fine in full if it came up. Technically the risk of pedophiles tracking them is negligible statistically but there are many valid civil rights perspective complaints it helps get people on board when they would otherwise roll their eyes at the complaints of teenagers a priori.