That’s understandable. They have done a lot of things to rebel against laws and acts that discriminate against various peoples and religions. From their website:
“We have publicly confronted hate groups, fought for the abolition of corporal punishment in public schools, applied for equal representation when religious installations are placed on public property, provided religious exemption and legal protection against laws that unscientifically restrict women's reproductive autonomy, exposed harmful pseudo-scientific practitioners in mental health care, organized clubs alongside other religious after-school clubs in schools besieged by proselytizing organizations, and engaged in other advocacy in accordance with our tenets.”
An example of them following this creed:
“ August 31, 2015. Modeled after Oklahoma’s bill that was struck down by their State Supreme Court, the Arkansas Legislature passed a bill introduced by State Senator Jason Rapert to install a Ten Commandments statue on State Capitol grounds. Because this violates the First Amendment by allowing the State to privilege one religion over others when the grounds are not open to other religious organizations, The Satanic Temple offered to donate its statue of Baphomet to be erected directly in front of the Ten Commandments. TST’s application was blocked by an emergency-session bill that requires all monuments to have legislative sponsorship. Because the purpose of the bill is to affirm the legislature’s intent to act in defiance of the Constitution, a lawsuit is pending.”
tl;dr: the TST basically advocates for common sense and religious freedom.