So people prefer to keep the houses empty and take the cost, knowing where renting it lawfully could led.
Wow, you would think all that market pressure would make house prices fall. Surely people would want to sell those properties, as renting sounds like a death sentence. Its almost as if they're lying and making a killing as they're doing it.
and have the message delivered.
How did the message delivery work out for you?
I think that both your lesser evil approach and mine “vote for someone else just because” approach are not good enough to offer a stable solution.