And how many have been caught and prosecuted to the full extent of the law (as pathetic as that may be)? How many are likely to be?
As for the pipe bombs, if you can show that these attacks have been directed against anyone because of their nationality or religion, then that would be an equivalent argument. Since you obviously cannot, it's simply more French "perfume" blown into the air to disguise the foul stench coming out of France.
As far as the time-frame for prosecution of criminals, are you aware that many of those in this country who are accused of murder do not go to trial for many years?