"First off, it is a no-brainer that we need effective background checks before someone may buy a gun. That does not "take" anyone's gun away. It merely better guarantees that gun owners are not dangers to the community."

While "effective background checks" are clearly necessary, it's impossible to actually ensure that they remove the danger to the community. It is the possession of the guns that turns gun owners into potential dangers. That goes double for any kind of assault rifle and such. They need to be outlawed in private hands, as they are in numerous countries.
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There is no incompatibility between someone being attracted by the gay orientation and gay community and loathing it. Self hatred of one sort and another is a very common phenomenon, and a very dangerous one. After all the classical pattern on this kind of mass killing normally culminate in the death of the perpetrator, either self inflicted or through "suicide by cop".