‘If the ad displayed a far worse (yet technically legal) image and was put up on 13th Avenue across from Shomer Shabbos, and the advertiser refused to change it, would anyone still be opposed to it being removed by “other means” so your children shouldn’t have to see it daily?’
Yes, I would oppose it. Vandalism is illegal. It is no different from some Christian fanatic torching a synagogue because he is offended from our denial of his messiah.