The pill is always portrayed as something very safe for example. did you see the surprised and `bger if women whe they realised that the risk of blood clot with the pill is much much higher than with the covid vaccine for example? Most women did NOT know how risky it is.
It is safe compared to pregnancy - that's the second bit of the sentence that people forget about. Like vaccines are safe compared to the disease they're protecting against. It's all balance of risk.
My impression is that a lot of UK law is about a proportional reaction to harm. A man deceiving a woman about contraception is putting her at significantly more risk (the extra risk of pregnancy), a woman doing the same to a man isn't putting him at any more risk than she is taking herself.
Morally, no, it's not right - but then neither are so many other things around sex - promising marriage, or cheating on someone.
To me the salient point is the extra risk, and that's all on the woman.
Obviously the exception to this is if one of the partners knows they have a sexually transmissible disease, and are thus putting their partner at increased risk if they lie about contraception (although again, given that it would be a barrier method, this is more likely to be a man putting a woman at risk than the other way round in mixed sex relationships)