Unless you're actively plotting to overthrow the government, commit violence against politicians or public property, or participate in major civil rights moveme

Unless you're actively plotting to overthrow the government, commit violence against politicians or public property, or participate in major civil rights movements, you should be more worried about a random nobody funnelling all their built up hate and frustration into making your life miserable than a three letter agency, yes. The difference is that the three letter agency has a budget, process and middle management so at the end of the day someone needs to justify why they're expending resources on making your life miserable whereas the random obsessive weirdo just needs to convince a bunch of other obsessive weirdos that you're a garbage person they can turn into their "lolcow" of the day/week/month/year. The three letter agency is more likely to inconvenience you out of apathy than to actually try to destroy you intentionally. The random nobody is more likely to try to drive you into suicide for a thrill.