The SNR is probably pretty high in VAERS in general most of the time, but when we have a misinformation pandemic combined with a real pandemic, it's easy to see how the data becomes polluted pretty fast.

And I agree, the USA should probably have better reporting systems!

Some other countries do, some of them have much better data quality than VAERS, and genuine analysis of them still agrees that the vaccines have a good safety profile. To just select a few English-language systems:

UK: https://coronavirus-yellowcard.mhra.gov.uk

Australia: https://www.ncirs.org.au/our-work/ausvaxsafety

Canada: https://cps.ca/impact

Some more background from McGill University: https://www.mcgill.ca/oss/article/covid-19-critical-thinking...