If I were suspected of loitering and resisted with force (as per your qualifier) you could be darned sure that they'd shoot me, too.
Eminent Domain is as old as the nation. Whereas the homeowners have a vested public interest in the lake, it is within the public's right to seek out a ruling of eminent domain over the lake.
If you think this is tyranny or communism, then the Founding Fathers were tyrannical commies, too, since they recognized the fact that property may be seized provided there is just compensation.
In any case, it is up to the courts to decide whether the original 1,000 clams is just compensation for the lake, or whether the owner can claim a loss of likely future revenues and seek more.
The owner has no right, either to shoot cops, or to take swings at their noses, just because they wish to serve him a summons for an eminent domain hearing. He has a right to do with his property as he pleases, unless and until his foolish actions as a public nuisance result in a takings under eminent domain.