I'd agree with this with the clarification that I am not referring to the RC airplane guy flying at an established field. I flew at PVMAC in Prado Regional Park last weekend. We are 3 miles from the center of Chino Airport (CNO) and have been there for years. We coexist quite nicely with the manned aircraft traffic and are one of the few RC fields actually noted on a sectional.It's the hobby/recreational knuckle heads that worry me not really the Professionals who should be and most likely are attempting to file NOTAMS etc.
Same goes for the RC field in Sepulveda Basin park just 1.5 miles from Van Nuys (VNY). Decades of flying with very few issues and never an actual incident at either location.