Intimidation is an insidious but effective weapon, used by those incapable of mounting a coherent and rational argument.
Those who engage in this crude and vicious form of persuasion know that a little can go a long way.
A phone call, a hoax device, a brick through a window, a bullet in the post. It can take minimal effort to achieve maximum results.
Intimidation is a poison, and the smallest dose can infect an entire body.
Clear evidence of the malign power of intimidation can be found in a Community Attitudes survey published as part of the Policing Board's annual report yesterday (Tuesday).
Of the Catholics questioned, 72% cited fear of intimidation or attack on themselves or relatives as a reason for not joining the police.
What is particularly worrying is that this figure is up 7% on the previous year, showing that this is a problem which is getting worse, not better.
It is also unlikely that the recent wave of attacks on members of the District Policing Partnerships will do anything to allay the fears of Catholics considering joining the PSNI.
Given the figures involved, this is an issue which must be taken seriously.
The clear inference is that if the threat of attack was removed then many more Catholics would apply to the police.
There is no doubt that, in the present climate, some potential recruits would find it difficult to come forward, particularly if they are living in republican areas.
If Sinn Féin endorsed the new arrangements, then the situation would be transformed.
In the meantime, those recruits who are starting a career in the police deserve widespread community support.
It is encouraging that, despite concerns over safety, the number of Catholics in the PSNI has risen from 8.9% to 11.7%.
As the Policing Board report makes clear, there is considerable work to be done in tackling rising levels of crime, particularly burglary and theft.
Effective, fair, representative and accountable policing can only be delivered if people are prepared to come forward and play their part.
Those who oppose the new arrangements have no right to impose their will through threats and intimidation.
