[nailer]

A similar argument could be used for environmental protestors blocking a highway (the reason the bill was created) - they're interfering with someone else's right to travel.

[hypertele-Xii]

Are the abortion protestors blocking access to the clinic? That's not the sentiment I got. They don't interfere with anyone's right to abortion, they are expressing their dissent about it (presumably on grounds of a child's right to be born).

[nailer]

Good question. Sometimes. In the US (but not the UK) I’ve seen images of women being jostled on the way into the clinic.