Shifting political preferences among the enfranchised have caused it to be a source of greater tension in the electorate, and changes in media have made it more visible, but it's not a new problem.
> Also i thought the point of the 2nd amendment was so you could rise up and overthrow a tyrannical government
The point of the 2nd Amendment was so that the people could be the security services and there would not be a need for standing military and paramilitary external and internal services (beyond small cadres to form a nucleus for the mobilized militia) which, in the founders view, inevitably led to tyranny. It was for prevention on a model that was abandoned though the amendment remains, not for response.