Man decapitates seagull at New Jersey pier, causing outrage.
Franklin Zeigler, 29, charged with third-degree animal cruelty.
Incident happened after seagull took fries from Zeigler's daughter.
Social media users condemn Zeigler's violent act against seagull.
"Danger to society," "Sicko," and "Horrible man" comments emerge.
Witness shares experience of seagull snatching glasses without retaliation
Decapitation occurred at Morey's Pier, Wildwood, New Jersey.
Petition with 45,000 signatures demands mental health counseling for Zeigler.
Petition fears Zeigler's next violent outburst might target humans.
Zeigler asked for trash bag while holding decapitated seagull.
Arrested for disorderly conduct and resisting arrest before animal cruelty charges.
People express fear and dismay over Zeigler's actions and behavior.