Tweaking the law

Another day, another waking up to a terrorist attack in this country.  The Westminster Bridge attack, a later knife attack outside the Houses of Parliament, the Manchester Arena attack, today a London Bridge attack.  More people die, more people injured when they were just going about their daily business.  The threat level is critical yet still the security services seem unable to prevent these things happening.  No doubt in the days to come there will be stories of how those who did this latest terrorism were known to the police, maybe even warnings were given to the police but that surveillance failed at a key moment.
Even during the IRA years the frequency (at least in Britain, specifically England) was never on this level.  It is estimated that our security services are keeping tabs on 18,000 people who potentially want to this country harm.  There has been talk of internment which is horrifying and invokes the shame that the USA has to this day when interning Japanese-Americans in World War Two (the same never happened to German-Americans).  However much these fanatical murderers of innocents want it, we are not at war
That is not to say nothing should be done.  The security services it seems are overwhelmed, foiling multiple terror plots yet still some get through.  Clearly the situation as it currently stands is untenable and though this will come across as a kneejerk reaction - the 'something must be done' which leads to bad laws - I hope whatever the government has planned (if it has anything at all, which is a doubt under the intellectual vacuity of the prime minister) would be along these lines.
This country operates a law where things in court must be proved beyond reasonable doubt.  For those who plan terrorist acts maybe that threshold should be lowered to 'on the balance of probabilities'.  Therefore the bar for deportation should be lowered and if UK-born, house arrest without internet access.  The bar is lowered but not precipitously so.  For some, that will go too far (leading to abuses), for others, not far enough.
Habeas corpus is not being suspended as Lincoln did during the Ammerican Civil War.  To ensure it is used only when the circumstances dictate, it should be a 'sunset law', to be renewed by parliament every year.  France has imposed a state of emergency.  I don't think putting troops on the streets will in any way enhance our security as it is Intelligence that is the real driver to preventing terrorism.  Yet there are many who live in our society who wish to destroy it along with everything it represents and everyone who operates by it.  They are pyschopaths and it is playing with fire to let such people be free at this moment in time.