Well, let's go through the statements that I quoted above, and for each of them everyone can determine for themselves whether they are false or true. For statements that are calls to action, instead feel free to determine whether they are desirable. And some of the statements are about the quoted user's mental state, which we can't evaluate:
- I feel like a caged Gorilla right about now
- I'd love nothing more, than to crack some f'ing liberal skulls
- Cracking f'ing liberal skulls is desirable and should be done
- Liberals have f'ing skulls, not regular skulls.
- The recent shooting at a Trump rally was an evil/liberal assassination conspiracy attempt
- There exists an evil/liberal conspiracy
- Trump is our true CIC/POTUS, life
- The evil liberal mother fu*kers are given free rein to attack our Country (our Freedoms)
- This should be a warning to everyone, meaning we need to take action against the evil liberal mother fu*kers
- CalGuns OT are (at least some) weak pathetic liberal pussies
- These weak pathetic liberal pussies only care about the f*cking Ukraine
- Here in America, our Country/Freedoms are being systematically destroyed
- And they are being destroyed by these filthy self-serving Treasonous MF'S
Nearly all the things said here are about politics, in the widest sense. Whether the above statements and instructions are true of false depends on everyone's personal views. But to your second question, whether they offensive or scary, here is my personal opinion: No, I don't find them scary at all; I think that person and all his fellow travelers do not pose a serious risk to either me or our society by doing violence. While political violence does exist in the US, it is not now (and never has been and isn't likely to become) of a scale that threatens my personal safety, or the survival and functioning of society and the state. There is a grave threat to our political system, but it doesn't come through violence, but through polarization, leading to disrespecting and ignoring the truth, societal norms, and the law.
Do I find these statements offensive? Absolutely not. Because they reflect the opinion of not just one person, but a significant fraction of the population. And honestly, it doesn't matter to me whether they are expressed with swear words or in fancy English. I have a very high tolerance for people speaking their mind, and I'm a free speech advocate in pretty much all realms.
What I do find offensive is outright lies. In particular in form of bad advice on legal questions. But offensive doesn't necessarily mean that speech should be prohibited; I think wrong statements in that realm should be argued and corrected.
The question we are discussing here in this thread is not whether the above statements (and many other similar ones) are true or false, or whether they are offensive, perhaps depending on using swearwords or the King's English. What we are discussing is whether in this particular forum they should be allowed or not. The reason this is an important question is that certain forms of speech make a discussion hard or impossible. What do you say to someone who advocates "cracking f'ing liberal skulls"? That this would be a crime, punishable under sections X, Y and Z of the California penal code? That political violence is not the answer and doesn't make our society work better? That cracking f'ing conservative skulls is also a good idea? That the statement is out of order because of the f-bomb? Is there any expectation that arguing with this particular poster is going to change his mind? That having a discussion about cracking skulls will make any difference whatsoever? That a constructive debate is possible when some forum members don't argue the points, but suggest cracking the other members' skulls?