Facing a Bubble Push from Short Stack

[Uppercut]

I got fixated on the possibility that I could be the one to knock out the short stack. I feel that I am generally too tight on the bubble in these situations, where I am in 3rd place and I just wait for a big stack to knock out the shorty. Then, if I do survive the bubble, I am extremely shortstacked gainst the other two players and usually end up in 3rd. I also was worried that one of the big stacks would call with a much worse hand than I possessed, so I figured I might as well be the one to call the all-in. Tell me the problems with my logic, please.