He's not inciting violence. He's actually extremely careful in his speech to not overgeneralize to all conservatives, and to call for unity and an end to violence. He says it constantly and you're twisting his words if you say that anything in his speech could be construed as a justification for political violence.
Now Trump on the other hand - where to even start? Oh well here I guess:
Trump made statements condoning and encouraging violence throughout his presidency.
www.axios.com
As for what measures are acceptable against extremists - firstly voting against anyone who supports the current GOP is very acceptable. If they go too far and do things like say attacking the capitol building, then they should be tried and convicted. It isn't a job for vigilante justice.