Shabbos is not negotiable, you must protest its honor. But, the current approach is a disaster. It’s turning more frum people off, instead of turning on the secular.
When dealing with an at-risk population, and the secular who truly don’t know better Yemin Mekareves is what works.
1. Having people who can calmly and cool-headedly “make the case” on the defense of Shabbos will soften the animosity towards it.
2. THE most effective tool if you want to “gouge the eyes” of those doing chillul Shabbos is showing love to them. Have a few tables with Shabbos refreshment packages (grape juice, challah, and bamba) with a little Good Shabbos note, letting them note that hopefully one day they will appreciate the love of Shabbos, until then we as your brother are there for you with all our love and concern.
Laugh all you want about these two techniques, but they get results within six months close to 100% of the time. These are the approaches Rabbi Finkel in Chicago uses for all issues affecting those in need of spiritual yeshuos. True love of people can drown away ALL doubts about religion. Fix the physical/emotional issues and the spiritual follows as a result.