"Thank you for your thoughts on this matter, I didn't read them. Here is a boilerplate statement espousing all the great things about this bill that you specifically criticized in your message to me. Please don't reach out again."
I wouldn't call it entirely pointless. I'd describe it as one of the easiest ways to be involved with politics, along with voting. It's very low commitment, and a low level of escalation/results. I highly recommend doing some training on union organizing, even if you aren't interested in organizing a union. The tradeoff between commitment and escalation is very important when determining what actions to take in all forms of organizing, including political organizing