The issue imo is that the LGBT movement is rampant in intentionally sexually deviant behavior, and they are more than happy to expose that behavior to children. One only needs to go to a pride parade in any city to see this unfold.
The other main problem is that by giving leeway to these movements instead of pushing against them from a morally absolute stance, you are jeopardizing the integrity of the family unit on which the strength of this society is founded upon. The LGBT movement has only been promoting more promiscuous lifestyles and this along with ideas pushed via the media has made waves into the mainstream. More promiscuity means higher divorce rates, more children growing up in unstable families, higher rates of failure into adulthood.
The -T part of the movement is its own animal. I suppose ultimately what it boils down to is what you believe the rationale for men wanting to become women is (because let's face it, they greatly outnumber females who choose to become males): are they being honest with themselves about their identifying as women, or is it a coping mechanism for having failed as men when faced with hardship? Seeing as the majority of trans "women" in my anecdotal experience began feeling dysphoric through exposure to porn, I'm inclined to believe the latter. It follows that normalization and celebration of the trans phenomenon is a harmful thing: dysphoria is a consequence of an unsound mind, not the cause of it, and the treatment these poor men prescribe for themselves has irreversible, debilitating consequences. I wouldn't wish my worst enemy to go down that path, God forbid my own children. And not long from now it will be all too common for governments to coerce you into putting your child through hormone replacement therapy.
I uses to think about the issue in a similar light. I had no qualms about LGBT identifying people aside from thinking two men holding hands is aesthetically icky. They aren't hurting anyone, so why should I care?
Well, considering they as a movement are pushing regressive, self destructive ideals on the society that my children will inherit, it becomes my business.
Long story short I am sick of this incessant faggotry.