OP comes across sanctimonious but is right to be concerned. One of the problems with drug dealers, small or large, is that commercial disputes are resolved in a violent manner. Unfortunately I've witnessed a resolution, and it was scary. Deeply unsettling. And I'm an adult. The children on the road were traumatised beyond belief. It was a beautiful estate but one sloppy landlord, in receipt of rent allowance on behalf of a single mother who was unable or unwilling to run an orderly house, let a horrendous situation develop. OP should fight tooth and nail to prevent something similar from happening.
Might be worth contacting the landlord. If the proposed tenants have criminal convictions the landlord might be able to veto them. And for a really far out suggestion, if the OP and neighbours feel strongly about this would they consider trying to buy the house off the landlord? 17 people ponying up €20k a head would probably pull it off.
What kind of say does the Landlord have I wonder if the council are leasing it off them? It certainly would be something we will try if its feasible.
Re buying the house I actually had that thought. I would certainly be in but obviously I have no idea would enough others, but there is a strong feeling amongst a majority of us I have to say.