I have never, ever seen a pro-vax site that did not underplay (some even scoff at) vaccine risks. I understand why they do this - there is a lot riding on selling the message that vaccines are safe. Whitewashing of information, however, is condescending and leaves people angry and untrusting when they find out the truth.
But that's your opinion of how they present the risks - and as I understand it from your previous posts here you think the risks are major and serious, so I can understand you would think they're being downplayed elsewhere. Main stream sites about vaccinations present the risks as minor, because that's that the science and evidence suggests.