A better way is to make landfills “protest” zones to be used by the “protesters”. Make it illegal for them to “protest” anywhere else. They can suck up the methane and be less of a nuisance to those of us who just want to be left alone to live our lives.
Methane is odorless and nontoxic in and of itself.
In high enough concentrations it can be suffocating. But it’s lighter than air and dissipates rapidly.
Sunlight also breaks it down rapidly in the atmosphere. It doesn’t persist like CO2 does.