It seems a number of people are confused by a defendant's right to remain silent throughout the trial, sitting there as merely as a dumb spectator while the prosecution presents its evidence, and with neither himself nor his legal representatives presenting a single jot of evidence on his behalf.
While that is indeed his right, it will almost invariably lead to a conviction unless the prosecution evidence is as weak as water (which it usually isn't, of course).
A court will weigh the evidence (we've all heard that expression) and if there's some on the prosecution's side of the scale and none on the defence's side, a conviction is very likely to ensue.
We've all seen fictional cases where the defence is desperately trying to find a missing witness or a vital piece of evidence in the absence of which the accused is going to be sent to meet his maker, haven't we?
And yet many a Mumsnet member would say with a huge smile to that defendant "Don't worry, old chap. It's okay. The law doesn't require you to present any evidence in your defence".
That Mumsnet member is right, of course. You don't have to present any evidence in your defence. The snag is that you'll almost certainly be convicted if you don't.