“I will compile for you a list of situations when one can ignore mitzvos in the spirit of “eis laasos lashem, hefeiru torosecho”.”
I was taught not to violate one mitzvah in order to perform another mitzvah and the only exceptions were in cases of pikuach nefesh. I was also taught that to pursue kiruv by relaxing the halacha was not true kiruv because by relaxing the halacha in order to supposedly attract wayward Jews, you are not leading them to Torah but away from Torah.