Bubble play with big stack, ethical?

[udontknowmickey]

This situation came up yesterday, and after I did it I wondered if it was entirely ethical.

Party 10+1
small stack in BB with around 5BB after posting. 4 people left in tourney
Folded to me on button. I'm running over the table on the bubble so I make my customary 3x BB raise without looking at my cards, planning to fold to a reraise. Too late I see the tiny stack that BB has. He pushes. Its one more BB to me and I'm getting the pot odds to call with any 2.

I fold figuring that having BB alive increases my chances of stealing from everyone else. shooting an angle or playing smart? BB ended up finishing 3rd.