You're not going to solve the problem and your municipality isn't helping unless it burning the garbage, because that's what contaminated loads are. There's absolutely no reason to have multi stream plastics recycling at the consumer end, save for plastic bags because at scale they can be recycled. Only a very small amount of plastics are monetarily valuable. I would not feel guilty at all about throwing out plastics unless they are clean and food free. It's pointlessly wasteful as most processing plants in the US cannot handle soiled recyclables efficiently if at all. I say this as a long time, Earth hugging, reusable bag toting, fuel efficient vehicle recycler. The US is not a major contributor to plastics pollution. There should be no moral dilemma here. Just by trying to do the right thing in this case you're doing. If you want to do more have a cheese pizza night once a week instead of one with meat toppings and you'll significantly reduce your carbon footprint with minimal change to your lifestyle. If doing the by the planet is your thing having one vegetarian meal that you enjoy a week is going to be significantly more impactful at keeping the planet cleaner and using less resources (the reduce part of the 3rs) than most of the plastics recycling you do. Contaminated glass, plastics, and paper can ruin an entire comingled load which generally happens anyways.
Some specifics on ocean plastics that covers a bit of general plastics.