Had the Charedim totally ignored them and let them be, they would have done they wanted in obscurity and nobody would be paying attention and they probably would have stopped as nobody new would have come and people would have dropped out.”
We’ll never know. But the fact is that they are deliberately seeking to cause divisiveness, and a frum person does not knowingly cause such damage in a public way. This is their cause du jour. If they REALLY had to put on Tallis and Tefillin every day (and they certainly could do so in privacy), they wouldn’t, because there would be no publicity value in that.