Why not just shoot Bond?!? So stupid

Ok...yes, I get that it's a James Bond movie and every Bond movie has some villain trying to kill him in some crazy way and he miraculously escapes, but this one just seems beyond stupid...he's already escaped multiple times, so what do the two gay killers do? Take him to an isolated construction site and...put him in a tube, knocked out?? Ridiculous. No reason in the world why they wouldn't just shoot him once they got him there. Likewise when he meets Blofield at the end, given how many times Bond has F'd up Blofield's plans before this there's just no reason why Blofield wouldn't get rid of him right then and there with so much on the line. At least in movies like From Russia With Love, there was at least some rationale behind the escapes!