"If we are to truely in control of our own lives then surely the right to suicide is one of our rights"
Indeed. But, as I pointed out, if you remove and easy method of doing it ON IMPULSE, lots and lots of people who would have taken that route decide, on a moment's reflection, not to do it AT ALL. You have a right to jump off a bridge... but it's a fact that if you make it even *slightly* difficult to get over the rail, the rate of jumpers er... falls. Drastically. If we can protect people from killing themselves on impulse - and we CAN - then surely we should. That does not in any way limit your right to jump off something tall if you really want to.
"without a gun another object could easily replace it as a weapon"
Really? You'd be happy bringing a knife to a gunfight?
Nothing easily replaces a gun. Guns are portable, fairly cheap, easy to use, reliable and safe (for the user - you can't cut yourself with it, but do see above re: killing yourself). With a loaded handgun a person with absolutely no training at all can have a reasonable chance at seriously injuring or killing a target from ten yards away. No other object can do that.