NL25: fold bottom set?

[CazicT]

If villian shows us 43, all-in would indded be -EV.

Although a flatcall will probably +EV. Is the villian really going to fold a straight when the board pairs? All we would need would be like a 1/2 pot size bet to break even.

This is just the case where he has specifically 43 though. I really believe you all are underestimating his ability to get all the money in the middle with only 2 pair.