Slightly related, was the reaction in the mid-1970s to Anita Bryant's vocal opposition to gays. We apparently don't know yet what this guy's motive was, if any, maybe merely deranged.
Bryant was the national spokesperson for the Florida citrus industry, the State's largest agricultural business. But then she decided on her own to engage in a personal and very public campaign against gays. Which did result in several State laws being passed aimed against gays, like an adoption prohibition. Subsequently overruled by the courts after decades of litigation.
So what did gays and lesbians do? Well, boycott Florida orange juice, naturally. And stage protests at her concerts, since she was also a performer.
But more insidious & illegal, and perhaps most effective, was sabotaging Florida orange juice in stores. Gays would jab pins into orange juice containers, making them leak. At a time when almost all juice containers were made of waxed cardboard, as some still are today, that task wasn't difficult.
Ruining the product, and creating a sticky mess for the store to clean. In the days before surveillance cameras were common everywhere these gays could go unnoticed if they were stealthy.
Although Bryant had her supporters (naturally Right Wingers and Christian fundamentalists) the citrus industry saw the bottom line in terms of lost revenue and damaged image. Their spokesperson was hired to sell THEIR product, not HER personal beliefs, whatever they were. Hired to enhance their sales, not reduce them.
Anita Bryant got fired, and her marginal career as an entertainer tanked. He life went into a downward spiral from which she never recovered. And my husband, who already lived here at the time, claims a lot of it was due to supermarket sabotage tactics. But which made no one sick, nothing like this incident with the mouse poison.